Numbers 23:27-30

Then Balak said to Balaam, “Please come, I will take you to another place; perhaps it will please God that you may curse them for me from there.” So Balak took Balaam to the top of Peor, that overlooks the wasteland. Then Balaam said to Balak, “Build for me here seven altars, and prepare for me here seven bulls and seven rams.” And Balak did as Balaam had said, and offered a bull and a ram on every altar.