Numbers 23:27-30

Then Balak said to Balaam, “Come, I will take you to another place. Maybe God will be pleased to let you curse them from there.” So Balak took Balaam to the top of Peor, the mountain that looks over the desert. Balaam told Balak, “Build me seven altars here and prepare for me seven bulls and seven male sheep.” Balak did what Balaam asked, and he offered a bull and a male sheep on each altar.