Mesilat Yesharim
For example, we see by Yoash [ben Achazya king of Judah] (Shemot Raba 8:2) who acted good all the days he was taught by his teacher Yehoyada HaKohen. But after the death of Yehoyada, his servants came and began to flatter him and magnify praises of him until they likened him to a god; "Then the king hearkened to them" (Divrei Hayamim II 24:17).