Numbers 23:29

Then Balaam said to Balak, "Build for me here seven altars, and prepare for me here seven bulls and seven rams."

Surrounding context

23:28 So Balak took Balaam to the top of Peor, that overlooks the wasteland.

23:29 Then Balaam said to Balak, "Build for me here seven altars, and prepare for me here seven bulls and seven rams."

23:30 And Balak did as Balaam had said, and offered a bull and a ram on every altar.