John Gill Commentary 1 Kings 8:25

"Now therefore, O Jehovah, the God of Israel, keep with thy servant David my father that which thou hast promised him, saying, There shall not fail thee a man in my sight to sit on the throne of Israel, if only thy children take heed to their way, to walk before me as thou hast walked before me." — 1 Kings 8:25 (ASV)

Therefore now, Lord God of Israel, keep with your servant David my father that you promised him That as he had fulfilled one part of his promise respecting himself, his immediate successor, so that he would fulfil the other respecting his more remote offspring:

saying, there shall not fail you a man in my sight, to sit on the throne of Israel ; one of David's posterity to inherit his throne and kingdom, but with this proviso:

so that your children take heed to their way ; in what way they walk, and how they walk in it:

that they walk before me as you have walked before me ; meaning as David walked, see (Psalms 132:11Psalms 132:12) .