Numbers 23:29

Revised Standard Version (RSV-CI)

And Balaam said to Balak, “Build for me here seven altars, and provide for me here seven bulls and seven rams.”

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So Balak took Balaam to the top of Peor, that overlooks the desert.

And Balak did as Balaam had said, and offered a bull and a ram on each altar.

And because God helped the Levites who were carrying the ark of the covenant of the Lord, they sacrificed seven bulls and seven rams.