Numbers 23:27-30

Then King Balak said to Balaam, “Come, I will take you to one more place. Perhaps it will please God to let you curse them from there.” So Balak took Balaam to the top of Mount Peor, overlooking the wasteland. Balaam again told Balak, “Build me seven altars, and prepare seven young bulls and seven rams for me to sacrifice.” So Balak did as Balaam ordered and offered a young bull and a ram on each altar.