Midrasz do Ezechiela 3:17

(Numb. 22:2:) NOW BALAK BEN ZIPPOR SAW (rt.: R'H) <ALL THAT ISRAEL HAD DONE TO THE AMORITES>. This text is related (to Deut. 32:4):THE ROCK!—HIS WORK IS PERFECT, <BECAUSE ALL HIS WAYS ARE JUSTICE>. [Thus] the Holy One did [not] leave the nations of the world a pretext for saying in the age to come: You alienated us and did not give us anything like what you gave Israel in this world.¹Tanh., 7:1; Numb. R. 20:1. [What] did the Holy One do? Just as he raised up kings, prophets, [and sages] for Israel, so did he raise them up from the nations of the world. Moreover, the kings, prophets, and sages [that belonged to Israel] were coupled with the kings, prophets, and sages that belonged to the nations of the world. He raised up Solomon as king over all the land, and he did the same for Nebuchadnezzar. The former built the Holy Temple, and the latter destroyed it. He gave David wealth, and he acquired the house for his name.²Cf. Ps. 30:1 [introduction]: a song at the dedication of the house (i.e., the Temple) of David. The Temple was David’s in that he acquired the materials to build it. He gave wealth to Haman, and he acquired a whole nation for slaughter. Every dignity Israel received, you find that the nations of the world received. In like manner he raised up Moses for Israel, who spoke with him any time that he wanted, <and> he raised up Balaam for the nations of the world, in order that he might speak with him any time that he wanted. Look at (rt.: R'H) what a difference there is between the prophets of Israel and the prophets of the nations of the world! The prophets of Israel warn the nation about transgressions, and so it says (in Ezek. 3:17): I HAVE APPOINTED YOU A SENTINEL FOR THE HOUSE OF ISRAEL. <Any> prophet who arose from the nations, however, established a breach to cut off mortals from the world to come. And not only that, but all the prophets had a merciful attitude towards both Israel and the nations of the world; for so did Isaiah say (in Is. 16:11): THEREFORE MY INNER PARTS THROB LIKE A HARP FOR MOAB…. And similarly has Ezekiel said (in Ezek. 27:2): RAISE UP A DIRGE OVER TYRE. But this cruel man rose up to uproot a whole nation without cause, for nothing. Therefore the parashah on Balaam was written to make known why the Holy One removed the Holy Spirit from the nations of the world. <It was> because this man arose out of them, and look (rt.: R'H) at what he did!

Variantly: "and I shall set them at your heads": If you guard your ways, your heads (i.e., your judges) will be guarded, and if not, your heads will not be guarded — whence we are taught that the guilt of Israel is on the heads of their judges. And thus is it written (Ezekiel 33:7-9) "A sentinel have I made you for the house of Israel. When you hear a word from My mouth, you must warn them for Me." (If you do not warn the wicked one and he dies, his blood will be on your head.)