Numbers 23:1, 14, 29

Then Balaam said to King Balak, “Build me seven altars here, and prepare seven young bulls and seven rams for me to sacrifice.”

So Balak took Balaam to the plateau of Zophim on Pisgah Peak. He built seven altars there and offered a young bull and a ram on each altar.

Balaam again told Balak, “Build me seven altars, and prepare seven young bulls and seven rams for me to sacrifice.”