Exodus 12:2

12:2 “This month is to be your beginning of months; it will be your first month of the year.

Exodus 12:6

12:6 You must care for it until the fourteenth day of this month, and then the whole community of Israel will kill it around sundown.

Leviticus 23:16-18

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. 23:17 From the places where you live you must bring two loaves of bread for a wave offering; they must be made from two tenths of an ephah of fine wheat flour, baked with yeast, as first fruits to the Lord. 23:18 Along with the loaves of bread, you must also present seven flawless yearling lambs, one young bull, and two rams. They are to be a burnt offering to the Lord along with their grain offering and drink offerings, a gift of a soothing aroma to the Lord.