1 Kings 11:4

When Solomon was old; as having now reigned nigh thirty years, when it might have been expected that age should have cooled his lust, and experience have made him wiser and better, and when probably he was secure as to any such miscarriages; then God permitted him to fall so shamefully, that he might be to all succeeding generations an example of God's severity, and of the folly, and weakness, and wickedness of the wisest and best men, when left to themselves. Turned away his heart after other gods, not that they changed his mind or opinion about the true God and idols, which is not credible; but that they cooled his zeal against them, obtained from him a public indulgence for their worship, and money for the making of idols, and the support of the charges of their priests and sacrifices, and possibly persuaded him sometimes in complaisance to join with them in the outward act of idol worship, or, at least, in their feasts upon their sacrifices, which was a participation of their idolatry. See Psalms 106:28 1 Corinthians 10:20.