Numbers 23:28-30

Young's Literal Translation

²⁸ And Balak taketh Balaam to the top of Peor, which is looking on the front of the wilderness,

²⁹ and Balaam saith unto Balak, `Build for me in this [place] seven altars, and make ready for me in this [place] seven bullocks and seven rams;'

³⁰ and Balak doth as Balaam said, and he offereth a bullock and a ram on an altar.