Numbers 23:27-30

And Balak said to Balaam, “Come now, 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, which overlooks the desert. And 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 each altar.