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Weekly Halacha

Selected Halachos relating to Parshas Matos-Masei

By Rabbi Doniel Neustadt

The following is a discussion of Halachic topics related to the Parsha of the week. For final rulings, consult your Rav.

..Everything that will not come in fire you shall pass through water (31:23)


From the verse quoted above, the Talmud (1) derives that utensils which are bought from a non-Jew, even if they are brand new, require immersion in a kosher mikveh. Just as a convert requires an immersion, symbolizing his conversion from non-Jew to Jew, so too, utensils require immersion when being transferred from the ownership of a non-Jew to a Jew (2). The vast majority of the Rishonim hold that this is a Biblical command (3). What follows is a basic review of which types of utensils require immersion.

The final rulings on whether a utensil requires immersion or not can be grouped into three categories:

  1. Utensils that definitely require immersion and the blessing of Al tevilas keilim (4);
  2. Utensils which--for one reason or another--may require immersion and the blessing is not recited;
  3. Utensils which do not require immersion at all.

The halachos concerning which type of utensils require immersion are based on two criteria:

  1. The material from which the utensil is made;
  2. The purpose for which the utensil is made and how it is used.

Let us review each of these.


There is one basic rule to follow: The Torah itself mentions only six types of metal utensils (5) as requiring immersion. The Talmud, however, says that all utensils made out of material which "when broken can be melted down and reformulated (6)" are considered like metal utensils and require immersion. The Talmud specifically mentions glass as being the type of dish that can be "reformulated" upon breaking (7).


Any type of metal, including brass, steel and aluminum.
Disposable aluminum pans which are used and thrown away do not require immersion. If they are going to be used more than once, most poskim require them to be immersed [even before using it the first time] (8), while others allow them to be used two or three times and then discarded (9).

Any type of glass (10).
Pyrex, Duralex and Corelle are all considered a form of glass (11).


  • Wood (12).
  • Stoneware (13).
  • Boneware, ivory (14).
  • Plastic, melmac, rubber, nylon (15).
  • Non-glazed earthenware (flower-pot dull finish) (16).
  • Paper, styrofoam.


Earthenware which has been lined or coated with lead (17).

Heavily glazed earthenware (18).

Porcelain or porcelain enamel.
Most of today's china dishes are included in this category. There are some poskim who maintain that these dishes do not require immersion at all (19). One may conduct himself in accordance with this view and many people have such a custom (20). Other poskim disagree and hold that china should be immersed without a blessing (21). In many places, this has become customary (22).

Corningware (23)--follows the same rule as porcelain.


The basic rule to follow: The Talmud states that only klei seudah, utensils used for a meal, are obligated in immersion. This includes all utensils which have direct contact with food--either during its preparation (24) or at meal time. Since the status of some items as klei seudah may be undetermined or in dispute, we will list different kinds of utensils--some that definitely require immersion, others which clearly do not, and those whose status is questionable and thus require immersion without reciting a blessing.

Bottle or can openers do not need immersion (25).

Stove racks [and a blech] on which pots are normally placed do not need immersion. If it is common that food is directly placed on it, like a grill or a toaster oven rack, then the rack is required to be immersed and a blessing recited (26).

Vegetable bins and refrigerator racks, even if the food touches them directly, do not need immersion (27).

A serving tray used to bring plates to the table is exempt from immersion. If food is placed directly on the tray, it requires immersion with a blessing (28).

A nut cracker requires immersion. Some poskim require a blessing as well (29), while others rule that a blessing should not be made (30).

A fruit and vegetable peeler requires immersion (31). If the peeler is used exclusively for raw, non-edible food, like a potato peeler which is used for nothing else, many poskim hold that no immersion is required (32).

An arts and crafts knife does not need immersion, even if the knife is occasionally utilized for food preparation (33).

Jars, bottles or metal boxes which are used to store food but are never brought to the table, require immersion without a blessing. If they are brought to the table, then they require immersion with a blessing (34).

Any utensil which is normally used for wrapped food only, does not require immersion. If its normal usage is without any wrapping, it must be immersed even if the food placed into it is wrapped (35).

Some poskim do not require immersion for a toaster (36). Many others require immersion with a blessing (37).

IMPORTANT NOTE: Many people mistakenly believe that utensils may be used one time before being immersed. This is wrong, and it has absolutely no basis in Halachah.


1 Avodah Zarah 75b.

2 Ritva ibid. quoting the Ramban, based on Yerushalmi.

3 See Tevilas Keilim, pg. 34 for a complete list.

4 Our custom is to recite this text whether immersing one utensil or many--Aruch ha-Shulchan Y.D. 120:22; Teharas Yisroel 9; Kochavei Yitzchak 1:10-6; Mibeis Levi (Nissan 5753, pg. 49).

5 Gold, silver, copper, iron, tin, lead.

6 Based on the interpretation of Rashi.

7 For a more detailed explanation see Aruch ha-Shulchan Y.D. 120:25 and Emes l'Ya'akov al ha-Torah and to Shabbos 15b.

8 Chelkas Yaakov 3:115; Minchas Yitzchak 5:32; Mibeis Levi (Nissan 5753, pg. 47).

9 Igros Moshe Y.D. 3:23.

10 Y.D. 120:1. The poskim agree that glass utensils are only Rabbinically obligated. A blessing is nevertheless recited--as in all Rabbinical mitzvos--see Chochmas Adam 73:1.

11 Harav M. Heinemann (Kashrus Kurrents vol. XV #3). There is also some metal mixed in them--Tzitz Eliezer 8:26.

12 Y.D. 120:6.

13 Rambam Hilchos Ma'acholos Asuros 17:6.

14 Several poskim quoted in Tevilas Keilim, pg. 232. A minority opinion requires them to be immersed--see Darkei Teshuvah 14.

15 This is the view of most poskim, see Chelkas Ya'akov 2:163; Kisvei Harav Henkin 2:60; Harav M. Feinstein (quoted in l'Torah v'Horah'ah, vol. 1, pg. 11, vol. 2, pg. 20 and pg. 42); Tzitz Eliezer 7:37; Be'er Moshe 2:52; Yabia Omer 4:8. A minority opinion holds that plastic dishes should be immersed without a blessing--see Minchas Yitzchak 3:76-78; Sheorim Metzuyanim b'Halachah 37:4 This is the custom in German congregations. See (Kol ha-Torah, vol. 42, pg. 14) where Harav Y.Y. Weiss rules that a yeshivah may be lenient with this stringency.

16 Chochmas Adam 73:1.

17 Rama Y.D. 120:1. See Darkei Teshuvah 28 that even if they are lined with lead on both the outside and inside, no blessing is said.

18 See Darkei Teshuvah 19 who quotes several views on this issue.

19 Pischei Teshuvah Y.D. 120:2; Shalmas Chaim 1:13; Harav M. Feinstein (quoted in l'Torah v'Horahah, vol. 2, pg. 20).

20 Yabia Omer 4:8.

21 Kitzur Shulchan Aruch 37:3 and Masgres ha-Shulchan.

22 Melamed Le'ohil Y.D. 47; Aruch ha-Shulchan 120:29; Darkei Teshuvah 12.

23 Harav M. Heinemann (Kashrus Kurrents vol. XV #3).

24 Some poskim hold that only utensils which are used in the final stage of food preparation require immersion, e.g., a pot, but not utensils which are used in the earlier stages, e.g., a cookie cutter.

25 Shach Y.D. 120:11. Even if the can opener touches the food it does not require immersion--Harav S. Wosner (quoted in Tevilas Keilim pg. 233).

26 Y.D. 120:4 and Pri Chodosh 12.

27 Harav S.Z. Auerbach (quoted in Tevilas Keilim, pg. 196). See also Be'er Moshe 4:99.

28 Tevilas Keilim, pg. 213.

29 Harav S.Z. Auerbach (quoted in Tevilas Keilim, pg. 220).

30 Harav M. Feinstein (quoted in Ohalei Yeshurun, pg. 46). Shevet ha-Levi 6:245-4 questions if a can opener requires immersion altogether.

31 Tevilas Keilim, pg. 221.

32 Avnei Yashefei 1:146 based on Aruch ha-Shulchan 35-36. Same halachah applies to a pocket knife, etc.

33 Darkei Teshuvah 45 quoting Pri Chodosh; Aruch ha-Shulchan 40-45. See Tevilas Keilim, pg. 52.

34 Harav S.Z. Auerbach (quoted in Tevilas Keilim pg. 197); Harav M. Feinstein (quoted in Oholei Yeshurun pg. 45).

35 Harav S.Z. Auerbach (quoted in Tevilas Keilim pg. 55).

36 Igros Moshe Y.D. 3:24.

37 See Tevilas Keilim pg. 208.

Weekly-Halacha, Copyright © 1997 by Rabbi Neustadt, Dr. Jeffrey Gross and Project Genesis, Inc. Rabbi Neustadt is the principal of Yavne Teachers' College in Cleveland, Ohio. He is also the Magid Shiur of a daily Mishna Berurah class at Congregation Shomre Shabbos.

The Weekly-Halacha Series is distributed L'zchus Hayeled Doniel Meir ben Hinda. Weekly sponsorships are available--please send email to the moderator, Dr. Jeffrey Gross

The series is distributed by the Harbotzas Torah Division of Congregation Shomre Shabbos, 1801 South Taylor Road, Cleveland Heights, Ohio 44118--HaRav Yisroel Grumer, Marah D'Asra

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