1 Kings 11:13

“ However that may be I will not rend away all the kingdom, but I will give one tribe to your son, for David my servant's sake, and for Jerusalem's sake which I have chosen.”

Furthermore, because He had promised to David that his throne and his kingship would last for ever and had guaranteed the permanence of his house (2 Samuel 7:16) he would not take the whole kingdom out of his son's hands, but would give him one more tribe other than Judah. And He would do this ‘for David My servant's sake, and ‘for the sake of Jerusalem which I have chosen'.

The notion that YHWH had chosen Jerusalem has never been stated before. But that choice had been made by David when he had brought the Ark into Jerusalem and placed it in a Sacred Tent at which sacrifices were offered, and YHWH had therefore ‘chosen it' for David's sake (compare 1 Kings 8:16 where no city had been chosen before). This was where David's kingship had been set up, and this was therefore where it would be continued. This was quite important, for strictly, now that Solomon had turned away from YHWH, Jerusalem should have been doomed (1 Kings 9:7). But for David's sake it was to be spared, because as David's city YHWH had chosen to watch over it. Jerusalem was not eternally chosen. It was chosen for David's sake.