Comentario sobre Números 22:12

לא תלך עמהם THOU SHALT NOT GO WITH THEM — He said: If so, I will curse them in my own place. Whereupon God answered: לא תאור את העם THOU SHALT NOT CURSE THE PEOPLE. — He said to Him: If so, I will bless them. He replied to him: They do not need your blessing, כי ברוך הוא FOR THEY ARE ALREADY BLESSED. A parable! People say to the hornet: neither any of your honey nor any of your sting! (Midrash Tanchuma, Balak 6).

לא תלך עמהם. Even if you were not to curse the people they referred to you are not at liberty to go with them. The reason is that I do not want you to set your evil eye on these people even without uttering any words. (compare the expression נתן עיניו בו in B’rachot 58 In that instance the victim was reduced to a heap of bones.)

ויאמר אלוקים אל בלעם, "G'd said to Bileam, etc." Why did the Torah have to write אל בלעם? Why was it not sufficient for the Torah to write: ויאמר לו, or ויאמר אליו "He said to him?" Why did G'd have to say "do not go and do not curse?" Moreover, why did G"d have to give as the reason כי ברוך הוא, that Israel is already blessed? Our sages in the above-quoted Midrash write as follows: "In the event Bileam would say I will curse them from here, G'd added 'do not curse!' If Bileam were to say that in that event he would bless the Israelites, G'd told him not to bother as they were blessed already."