פירוש על מלכים א 11:7

Then Shlomo built a Bomoh [altar]. Our Rabbis said, that because he did not protest against his wives, it is called by his name.³Maseches Shabbos 56b. A Jew is responsible for the behavior of those subject to his influence. The Torah demands, “you shall reprove your fellow and do not bear a sin on his account” [Vayikra 19:17], implying that if you fail to reprove him, you will bear his sin.—Ralbag

On the mountain opposite Yerusholayim. The Mount of Olives.