The Counting of the Omer
11. On the first night of Shavuos, the recitation of Ma'ariv (the evening
service) is delayed until after the appearance of [three medium-size]
stars. Were we to recite the prayers beforehand and accept the sanctity of
the festival, we would be detracting time from the forty-nine days of the
counting of the Omer, and the Torah explicitly states [Leviticus 23:15]:
"You shall count seven COMPLETE weeks." (1).
(1) Once Ma'ariv for Yom Tov has been recited, it is considered Yom Tov
even if it is still daytime. There is supposed to be 49 full days counted
before Shavuos, and that cannot occur if one brings in Yom Tov before
nightfall on the 49th day,
Halacha-Yomi, Copyright (c) 2002 Project Genesis, Inc.
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