Leviticus 19:6

19:6 It must be eaten on the day of your sacrifice and on the following day, but what is left over until the third day must be burned up.

Leviticus 23:6

23:6 Then on the fifteenth day of the same month will be the festival of unleavened bread to the Lord; seven days you must eat unleavened bread.

Leviticus 23:16

23:16 You must count fifty days – until the day after the seventh Sabbath – and then you must present a new grain offering to the Lord.