DOVID KORNREICH'S SHIUR asked:
The Gemara cites the term "YOM" in various contexts of mitzvos to prove that their appropriate time to be done is during the daytime. But doesn't the Jewish calendar and therefore the Torah include the previous NIGHT when in mentions "YOM"?
DOVID KORNREICH'S SHIUR, Jerusalem
The Kollel replies:
Although a day is twenty-four hours and includes a night and a day, there are two parts in a day: a Yom and a Lailah, as in creation, "Erev" and "Boker." Therefore, when it says "Yom" (as in "b'Yom Tzavoso" in Vayikra 7:38) it means daytime.
D. Zupnik