John Gill Commentary Numbers 24:2

"And Balaam lifted up his eyes, and he saw Israel dwelling according to their tribes; and the Spirit of God came upon him." — Numbers 24:2 (ASV)

And Balaam lifted up his eyes
Being on Mount Peor:

and he saw Israel abiding in his tents according to their tribes ;
in that exact order in which they were directed to encamp under four standards, and so many tribes under each standard, (Numbers 2:1–34)

and the Spirit of God came upon him ;
not in his grace but in his gifts; not as a spirit of sanctification, but as a spirit of prophecy, as the Targums of Onkelos and Jonathan paraphrase it; and so sometimes the Spirit of God in this sense has come upon wicked men, as on Caiaphas and others, (John 11:51) (Matthew 7:22Matthew 7:23) .