And God said unto Balaam, thou shalt not go with them
 Which is a denial of the first thing Balak requested, "come now, therefore" ( Numbers 22:6 ) 
 thou shall not curse the people;
 which was the principal thing desired, and in order to which he was solicited to go with the messengers; but this is absolutely forbidden: 
 for they are blessed;
 by the Lord himself, with an irrevocable blessing, and therefore it would be vain and fruitless, as well as dangerous for him to attempt to curse them, ( Genesis 12:3 ) this may have a special respect to the blessing of Jacob by Isaac, which could not be reversed by the solicitations of Esau, and which descended to Jacob's posterity, the Israelites, ( Genesis 27:33 ) .