Exodus 1:16

1:16 “When you assist the Hebrew women in childbirth, observe at the delivery: If it is a son, kill him, but if it is a daughter, she may live.”

Exodus 12:25

12:25 When you enter the land that the Lord will give to you, just as he said, you must observe this ceremony.

Exodus 34:22

34:22 “You must observe the Feast of Weeks – the firstfruits of the harvest of wheat – and the Feast of Ingathering at the end of the year.