'Commitment' in the Bible

Then Solomon prayed: "Blessed is the LORD God of Israel, who made a commitment to my father David and then personally fulfilled what he had promised when he said:

"LORD God of Israel, there is no one like you, God in heaven above or on the earth below, who watches over his covenant, showing gracious love to your servants who live their lives in your presence with all their hearts. It is you, LORD God, who have kept your promise to my father, your servant David, that you made to him. Indeed, you made a commitment to my father David and then personally fulfilled what you had promised today.