Or HaChaim on Numbers 22:9/אור החיים על במדבר כ״ב:ט׳

1 מי חאנשים האלה עמך, "who are these men with you?" Why did G'd bother to ask him? Didn't He know who these men were and why they had come? Also, why did G'd have to say עמך, "with you?" It would have been enough to say האלה "these." We also have to understand Bileam's peculiar reply. To the question who these men are he replies who has sent them. Our sages in Yalkut Shimoni item 765 have noted this oddity and wrote as follows: "Bileam said to G'd: 'I do not know who these people are but Balak the son of Tzippor has sent them to me, etc.'" The Yalkut means that from the way Bileam phrased his answer G'd was supposed to conclude that he was unaware of who precisely these messengers were. He certainly did not say outright: "I do not kow, etc." Why did Bileam have to add that Balak was the king of Moav? Was it not enough that he told G'd the name of the man? I believe that we can best understand G'd's question after remembering what I have written about the words "stay here overnight," that Bileam invited these messengers to sleep with him in the same room. G'd wanted to know what was so special about these people whom Bileam had invited to be present when he expected to be addressed by an angel of G'd. After all, G'd implied, this room is the one you have reserved for when I communicate with you. The word האלה implies that these people are not deserving of such an honour, much as the words מי אנכי, "who am I" in Exodus 3,11 suggest that Moses did not consider himself worthy of the task G'd wanted to entrust to him. From G'd's question it is evident that He was concerned with the honour due to Bileam vis-a-vis the Gentile nations amongst whom he was rated as a prophet. We find a statement in Bamidbar Rabbah 20,14 that G'd killed the she-ass Bileam was riding on as she was belittling him. When we look at the next verse (10) we see that Bileam understood what G'd meant and that is why he said that Balak the king of Moav had sent these men, i.e. they deserve to be honoured as they came on an errand from the king. He gave Balak's full name to indicate that Balak had already been an important prince in Midian even before his elevation to become king over Moav.

2By mentioning that Balak was king over Moav he wanted to remind G'd that the Moabites were not one of the nations which would be given to the Israelites to conquer. He was very astute in hinting at this as he wanted G'd's consent to accept the assignment and he did not want G'd to put any obstacle in his way.