John Gill Commentary 1 Kings 8:40

"that they may fear thee all the days that they live in the land which thou gavest unto our fathers." — 1 Kings 8:40 (ASV)

That they may fear thee
For his goodness sake in hearing their prayer, removing their affliction, and bestowing his blessings on them, particularly in forgiving their sins, see (Psalms 130:4) (Hosea 3:5)

all the days that they live in the land which you gave unto our
fathers ;
not only for the present, while the mercy is fresh, but all the days of their lives; to which they were the more obliged by the good land they possessed as a divine gift, and which they held by the tenure of their obedience, (Isaiah 1:19) .