John Gill Commentary Numbers 23:30

"And Balak did as Balaam had said, and offered up a bullock and a ram on every altar." — Numbers 23:30 (ASV)

And Balak did as Balaam had said Though the sacrifices were expensive, he did not grudge them; he spared no cost to gain his point, though he now could have but little hope of it: and offered a bullock and a ram on every altar; as he had done before, (Numbers 23:2Numbers 23:14) .