Numbers 23:29

And Balaam said unto Balak,.... Being willing to try again what could be done, and to gratify the king, and especially to get the wages of unrighteousness, if possible, which he dearly loved, as the apostle says, 2 Peter 2:15

build me here seven altars, and prepare me here seven bullocks and seven rams; which had been done in two places before, Numbers 23:1 the same sort of creatures, and the same number here as there, and these only clean creatures, such as were used in sacrifice by the true worshippers of God, and which, no doubt, Balaam had knowledge of, and therefore judged that those would be most acceptable to the Lord.