4 For it happened, when Solomon was old, that his wives turned away his heart after other gods; and his heart was not perfect with Yahweh his God, as was the heart of David his father. 5 For Solomon went after Ashtoreth the goddess of the Sidonians, and after Milcom the abomination of the Ammonites. 6 Solomon did that which was evil in the sight of Yahweh, and didn’t go fully after Yahweh, as did David his father.
Matthew Henry's Commentary on 1 Kings 11:4-6
Commentary on 1 Kings 11:1-8
(Read 1 Kings 11:1-8)
There is not a more melancholy and astonishing instance of human depravity in the sacred Scriptures, than that here recorded. Solomon became a public worshipper of abominable idols! Probably he by degrees gave way to pride and luxury, and thus lost his relish for true wisdom. Nothing forms in itself a security against the deceitfulness and depravity of the human heart. Nor will old age cure the heart of any evil propensity. If our sinful passions are not crucified and mortified by the grace of God, they never will die of themselves, but will last even when opportunities to gratify them are taken away. Let him that thinks he stands, take heed lest he fall. We see how weak we are of ourselves, without the grace of God; let us therefore live in constant dependence on that grace. Let us watch and be sober: ours is a dangerous warfare, and in an enemy's country, while our worst foes are the traitors in our own hearts.