Rashi on Numbers 23:19/רש"י על במדבר כ״ג:י״ט

1לא איש וגו׳ [GOD IS] NOT A MAN [THAT HE SHOULD LIE] — He has already sworn to them that He will bring them thither and give them as a possession the land of the seven peoples, and you think to slay them in the wilderness?! (cf. Midrash Tanchuma, Vayera 13)

2ההוא אמר וגו׳ — Read this in the form of a question: HATH HE SAID, [AND SHALL HE NOT DO IT]? — The rendering of ויתנחם in the Targum, ותיבין ומחמלכין, means, “[and not as the doings of mortals who decide to do things] and again reconsider” — to withdraw from them.