Moses
Numbers 23:1ESV·traditional attribution

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

John Calvin Reformed @genevareformer

1. Build me here seven altars. We more positively conclude from hence that this degenerate prophet had been by no means wont to prophesy in accordance with pure revelations from God, but that the art of divination, in which he boasted, had some affinity to magical exorcisms, and was infected with many errors and deceptions.

Matthew Henry Presbyterian @wholebiblehenry

Here is, I. Great preparation made for the cursing of Israel. That which was aimed at was to engage the God of Israel to forsake them, and either to be on Moab's side or to stand neuter. O the sottishness of superstition, to imagine that God will be at men's beck!

Commenting on Numbers 23:1-12

John Gill Reformed Baptist @doctorgill

And Balaam said unto Balak,.... When upon one of the high places of Baal, and after having taken a view of the people of Israel as they lay encamped: build me here seven altars; this was purely Heathenish; for not only the Israelites after the law of Moses had but one altar, but the patriarchs before that never built but one altar at a time.