'Fulfill' in the Bible

and the Lord will fulfill his promise to me, 'If your descendants watch their step and live faithfully in my presence with all their heart and being, then,' he promised, 'you will not fail to have a successor on the throne of Israel.'

"As for this temple you are building, if you follow my rules, observe my regulations, and obey all my commandments, I will fulfill through you the promise I made to your father David.