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 25:37

25:37 “You are to make its seven lamps, and then set its lamps up on it, so that it will give light to the area in front of it.

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.