Numbers 23:1-2, 29

And Balaam said unto Balak, Build me here seven altars, and prepare me here seven oxen and seven rams. And Balak did as Balaam had spoken; and Balak and Balaam offered on every altar a bullock and a ram.

And Balaam said unto Balak, Build me here seven altars, and prepare me here seven bullocks and seven rams.