His foreign wives led him astray

1 Kings 10:23-11:3
Solomon spent much money purchased chariots and horses from Egypt. Solomon accumulate fourteen hundred chariots and twelve thousand horses, which he kept in the chariot cities and also with him in Jerusalem.
King Solomon, however, loved many foreign women besides Pharaoh's daughter - Moabites, Ammonites, Edomites, Sidonians and Hittites. They were from nations about which the Lord had told the Israelite, "You must not intermarry with them, because they will surely turn our hearts after their gods."
His wives led him astray.
Foreign wives bring with them foreign gods( as Exodus 34:16 had warned)
Why?
Solomon had higher wisdom and much money and respected honor, so his heart became proud and ignore the word of the Lord, turned to downfall of his life.
When the heart is turn away from the Lord, then it is the way to the downfall.
The sin is always attract us if we don't aware it, prosperity is good and blessing from the Lord, but it is may led us turn to our selfish and blind our heart.
How?
Do not rely on our strength or mind to resist be a good man, but keep us with pure heart and mind to follow God's word.