1 Kings 11:2

[God] promised that something everlasting would spring from David's seed. Then Solomon was born, and he became a man of such profound wisdom that everyone supposed God's promise concerning David's offspring had been fulfilled in him. But no, Solomon fell and so made room for people to stretch their hope toward Christ. God can neither be deceived nor deceive us, so we can be certain that he did not ground his promise in Solomon, for he knew Solomon would fall. The divine purpose was that after Solomon's fall you would look to God and earnestly press him for what he had promised.Did you lie, then, Lord? Do you go back on your promises? Do you fail to deliver what you swore to give? Perhaps God will counter you by saying, "I did swear, and I did promise, but that man did not persevere." But how can that be the answer? Did you not foresee, O Lord God, that he would not persevere? Of course you foresaw it. Why, then, did you promise me something that would last forever and attach that promise to someone who would not persevere? You said to me, " 'If his children forsake my law and do not walk according to my ordinances, if they break my commandments and violate my covenant,' nevertheless my promise shall endure, and my oath shall be fulfilled. 'Once I have sworn in my holiness,'4 within myself." In that most secret place you swore it, in the fountain from which the prophets drank, those prophets who belched out for us the words, "Once have I sworn in my holiness, and I will not lie to David." Make good your oath then, and deliver what you promised. I was stripped away from David of old, lest in that David we should hope for its fulfillment, and so that you can say to us, "Keep hoping for what I promised." Even David himself was aware of this. Consider what he says: "Yet you, you yourself, have rejected him to nothing." So what has become of your promise? […]

However, in [David's] son Solomon libido was not a passing guest; it reigned as a king. Scripture does not pass this over in silence but blames him as a lover of women. His beginnings were redolent with the desire for wisdom; when he had obtained it through spiritual love, he lost it through carnal love.

Solomon was master of a great deal of knowledge, but to what purpose, when he had no better a government of his appetites? He was drawn by them to the worship of strange gods, as Israel to Baal-peor by the daughters of Moab. This was the bad consequence of his multiplying wives.

Of the nations concerning which the Lord said unto the children of Israel, ye shall not go in to them, neither shall they come in unto you,....

Some think it was in policy that he married these foreigners, by them to get intelligence of the state of those countries. I rather fear it was because the daughters of Israel were too grave and modest for him, and those foreigners pleased him with the looseness and wantonness of their dress, and air, and conversation.