Chasidut sobre Números 22:20

Numbers 22,22. “G’d’s anger flared up because Bileam ‎was going.” Nachmanides already poses the question of why G’d ‎was angry at Bileam since He had given him permission to go ‎when He had said: ‎אם לקרוא לך באו האנשים קום לך אתם‎, “if the men ‎have come to invite you, rise and go with them.” (Numbers 22,20)‎
The answer to this question has already been provided by ‎‎Rashi (hundreds of years before Nachmanides posed it) ‎when he commented on that verse: “if their invitation is intended ‎for your personal benefit you may go.” Seeing that the purpose ‎of the call for Bileam to curse the Jewish people was intended to ‎benefit Balak and his people, G’d’s permission clearly did not ‎include such a scenario, and He had reason to be furious. ‎Nachmanides quotes Rashi in his commentary to show that ‎he was aware of this answer.‎
Our author feels that Bileam’s going with Balak’s emissaries ‎showed that he enjoyed being called upon to curse the Jewish ‎people. This was in clear contradiction to his having been told ‎that the Jewish people who were a blessed people could not be ‎harmed by any curses. Seeing that this was so, he was now ‎culpable not only for the curses he had intended to pronounce, ‎but for the evil intention itself, something G’d usually does not ‎punish a person for.‎

Numbers 23,20. “here I have been instructed to bless, ‎since He has blessed I cannot reverse it.” Bileam clearly ‎explains to Balak his inability to alter G’d’s decrees, as he told him ‎before when he said that the difference between man and G’d is ‎that G’d does not lie. On the other hand, although G’d does not ‎reverse Himself, the righteous are able by their prayers to bring ‎about a reversal of decrees harmful for the Jewish people. ‎‎[In other words, man can sometimes accomplish what G’d ‎is prevented from doing by His own initiative. Ed.]‎