John Gill Commentary 1 Kings 8:24

"who hast kept with thy servant David my father that which thou didst promise him: yea, thou spakest with thy mouth, and hast fulfilled it with thy hand, as it is this day." — 1 Kings 8:24 (ASV)

Who has kept with your servant David my father that you promised him . &c.] Concerning a son, his successor, and the builder of the temple:

you, spoke also with your mouth, and has fulfilled it with your hand , as it is this day; the temple being now finished by him, see (1 Kings 8:15) .