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 13:6

13:6 For seven days you must eat bread made without yeast, and on the seventh day there is to be a festival to the Lord.

Exodus 16:26

16:26 Six days you will gather it, but on the seventh day, the Sabbath, there will not be any.”

Exodus 24:18

24:18 Moses went into the cloud when he went up the mountain, and Moses was on the mountain forty days and forty nights.

Exodus 29:35

29:35 “Thus you are to do for Aaron and for his sons, according to all that I have commanded you; you are to consecrate them for seven days.