Numbers 8:2

8:2 “Speak to Aaron and tell him, ‘When you set up the lamps, the seven lamps are to give light in front of the lampstand.’”

Numbers 23:14

23:14 So Balak brought Balaam to the field of Zophim, to the top of Pisgah, where he built seven altars and offered a bull and a ram on each altar.