John Gill Commentary Numbers 22:13

"And Balaam rose up in the morning, and said unto the princes of Balak, Get you into your land; for Jehovah refuseth to give me leave to go with you." — Numbers 22:13 (ASV)

And Balaam rose up in the morning
With the impression of the dream upon his mind, and of what had passed between God and him in it:

and said unto the princes of Balak ;
which shows what the elders were that were sent, of what honour and dignity, and may include both those of Moab and of Midian:

get you into your land ;
as soon as you can; set forward on your journey, it is to no purpose to stay here:

for the Lord refuses to give me leave to go with you ;
he only relates one part of the answer he had from the Lord, respecting his going with them, but says not a word of his being forbid to curse Israel, and of the reason given why he should not; had he reported this, in all probability it would have prevented any further application to him, and so any attempt to get this done, which Balaam seemed aware of; and therefore, by concealing this, hoped for fresh solicitations and entreaties, and that in time the Lord might be prevailed on to let him go and curse them; he having a covetous desire of riches, honour, and preferment, in Balak's court.