Exodus 12:2

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

Exodus 29:38

29:38 “Now this is what you are to prepare on the altar every day continually: two lambs a year old.

Exodus 34:23

34:23 At three times in the year all your men must appear before the Lord God, the God of Israel.

Exodus 40:17

40:17 So the tabernacle was set up on the first day of the first month, in the second year.