'Mercy' in the Bible

Then Solomon said, “You have shown Your servant David my father great lovingkindness, because he walked before You in faithfulness and righteousness and with uprightness of heart toward You; and You have kept for him this great lovingkindness, in that You have given him a son to sit on his throne, as it is today.

He said, “O Lord, the God of Israel, there is no God like You in heaven above or on earth below, who keeps the covenant and shows lovingkindness to Your servants who walk before You with all their heart;