Walked in all the sins of his father. — This adoption of the idolatries of Rehoboam did not prevent Abijam (see 2 Chronicles 13:4-12) from representing himself as the champion of the Temple and the priesthood against the rival worship of Jeroboam, and dedicating treasures — perhaps the spoils of his victory — in the house of the Lord. From the qualified phrase “his heart was not perfect before God,” however, it may be inferred that, like Solomon and Rehoboam, he professed to worship Jehovah only as the supreme God of his Pantheon; and it is a curious irony of circumstance that he should be recorded as inveighing against the degradation of His worship in Israel, while he himself countenanced or connived at the worse sin of the worship of rival gods in Judah.
Related Commentaries of 1 Kings 15:3
1 Kings 15:3
3 And he walked in all the sins of his father, which he had done before him: and his heart was not perfect with the LORD his God, as the heart of David his father.