Numbers 23:29

New International Version

Balaam said, “Build me seven altars here, and prepare seven bulls and seven rams for me.”

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And Balak took Balaam to the top of Peor, overlooking the wasteland.

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

Because God had helped the Levites who were carrying the ark of the covenant of the Lord, seven bulls and seven rams were sacrificed.