Exodus 2:2

2:2 The woman became pregnant and gave birth to a son. When she saw that he was a healthy child, she hid him for three months.

Exodus 8:27

8:27 We must go on a three-day journey into the desert and sacrifice to the Lord our God, just as he is telling us.”

Exodus 10:22

10:22 So Moses extended his hand toward heaven, and there was absolute darkness throughout the land of Egypt for three days.

Exodus 21:11

21:11 If he does not provide her with these three things, then she will go out free, without paying money.