Reaping the Omer at Night and Setting Aside the Shabbat

Another interpretation: Why is "you shall offer" stated? Because the commandment is to reap it at night, from where do we learn that if it was reaped by day it is valid, and that it overrides the Sabbath? Scripture teaches, "you shall offer." "You shall offer" - whatever its condition. "You shall offer" - from any place. "You shall offer" - even on the Sabbath. "You shall offer" - even in a state of ritual impurity. But have we not learned in the Mishnah, "All the night is valid for reaping the omer," and so on - which implies that what pertains to the day does not pertain to the night, so likewise what pertains to the night should not pertain to the day? Rava said: This is not difficult. This Mishnah follows Rabbi Elazar son of Rabbi Shimon, for it was taught: If one was standing and offering the omer meal-offering and became impure, if there is another, he is told, "Bring another in its place"; and if not, he is told, "Be clever and keep silent" - the words of Rabbi [Judah the Prince]. Rabbi Elazar son of Rabbi Shimon says: In either case he is told, "Be clever and keep silent," for any omer reaped not according to its commandment is invalid.