LifeCycle Events: Birth, Bris: A Bris Being Done in the Day:
Why must a bris be done in the daytime?
The Talmud derives this from the extra "vav" in Lev. 12:3
(AND on the eighth day...): Even a bris that is not done on
the eighth day must still be done in the daytime. In fact,
if a bris is done at night, it must be "redone" during the day
by causing a drop of blood to flow (Yoreh Deah 262:1).
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