Exodus 12:1-3 Now the LORD spoke to Moses and Aaron in the land of Egypt, saying, 'This month shall be your beginning of months; it shall be the first month of the year to you. Speak to all the congregation of Israel, saying: "On the tenth of this month every man shall take for himself a lamb, according to the house of his father, a lamb for a household.
Exodus 23:14-15 “Three times you shall keep a feast to Me in the year: You shall keep the Feast of Unleavened Bread (you shall eat unleavened bread seven days, as I commanded you, at the time appointed in the month of Abib, for in it you came out of Egypt; none shall appear before Me empty);
Exodus 12:6 Now you shall keep it until the fourteenth day of the same month. Then the whole assembly of the congregation of Israel shall kill it at twilight.
Exodus 13:4 On this day you are going out, in the month Abib.
2 Kings 23:23 But in the eighteenth year of King Josiah this Passover was held before the LORD in Jerusalem.