Solomon's undeserved favor

“Now, my son, may the Lord be with you! May you succeed and build a temple for the Lord your God, just as he announced you would. Only may the Lord give you insight and understanding when he places you in charge of Israel, so you may obey the law of the Lord your God. Then you will succeed, if you carefully obey the rules and regulations which the Lord ordered Moses to give to Israel. Be strong and brave! Don’t be afraid and don’t panic! ~ 1 Chronicles 22:11-13

David instructs his son that if he obeys the Old Testament Law, he will succeed.   God gives him the same instruction.

You must serve me with integrity and sincerity, just as your father David did. Do everything I commanded and obey my rules and regulations. Then I will allow your dynasty to rule over Israel permanently, just as I promised your father David, ‘You will not fail to have a successor on the throne of Israel.’

“But if you or your sons ever turn away from me, fail to obey the regulations and rules I instructed you to keep, and decide to serve and worship other gods, then I will remove Israel from the land I have given them, I will abandon this temple I have consecrated with my presence, and Israel will be mocked and ridiculed among all the nations. This temple will become a heap of ruins; everyone who passes by it will be shocked and will hiss out their scorn saying, ‘Why did the Lord do this to this land and this temple?’ Others will then answer, ‘Because they abandoned the Lord their God, who led their ancestors out of Egypt. They embraced other gods whom they worshiped and served. That is why the Lord has brought all this disaster down on them.’” ~ 1 Kings 9:4-9

Well, Solomon does not obey God's rules and regulations.  However, he still continued to prosper.

Solomon did evil in the Lord’s sight; he did not remain loyal to the Lord, like his father David had.  Furthermore, on the hill east of Jerusalem Solomon built a high place for the detestable Moabite god Chemosh and for the detestable Ammonite god Milcom. He built high places for all his foreign wives so they could burn incense and make sacrifices to their gods. 

The Lord was angry with Solomon because he had shifted his allegiance away from the Lord, the God of Israel, who had appeared to him on two occasions and had warned him about this very thing, so that he would not follow other gods. But he did not obey the Lord’s command.  So the Lord said to Solomon, “Because you insist on doing these things and have not kept the covenantal rules I gave you, I will surely tear the kingdom away from you and give it to your servant.  However, for your father David’s sake I will not do this while you are alive. I will tear it away from your son’s hand instead.  But I will not tear away the entire kingdom; I will leave your son one tribe for my servant David’s sake and for the sake of my chosen city Jerusalem.” ~ 1 Kings 11:6-13

Because of God's love for David, Solomon did not suffer the consequences for his actions.  Instead they were visited on his children.  Solomon received unpromised grace.