2 Chronicles 21:7
“Howbeit the Lord would not destroy the house of David, because of the covenant that he had made with David, and as he promised to give a light to him and to his sons for ever.”
Jehoram was thirty and two years old when he began to reign, and he reigned eight years in Jerusalem.
And he walked in the way of the kings of Israel, like as did the house of Ahab: for he had the daughter of Ahab to wife: and he wrought that which was evil in the eyes of the Lord.
Howbeit the Lord would not destroy the house of David, because of the covenant that he had made with David, and as he promised to give a light to him and to his sons for ever.
In his days the Edomites revolted from under the dominion of Judah, and made themselves a king.
Then Jehoram went forth with his princes, and all his chariots with him: and he rose up by night, and smote the Edomites which compassed him in, and the captains of the chariots.
Counter-Arguments
The strongest case that this verse does not belong in this theme.

Cross-References
“And unto his son will I give one tribe, that David my servant may have a light alway before me in Jerusalem, the city which I have chosen me to put my name there.”
“There will I make the horn of David to bud: I have ordained a lamp for mine anointed.”
“And when thy days be fulfilled, and thou shalt sleep with thy fathers, I will set up thy seed after thee, which shall proceed out of thy bowels, and I will establish his kingdom.”
“There will I make the horn of David to bud: I have ordained a lamp for mine anointed.”
“My mercy will I keep for him for evermore, and my covenant shall stand fast with him.”