John Gill Commentary Psalms 115:13

"He will bless them that fear Jehovah, Both small and great." — Psalms 115:13 (ASV)

He will bless them that fear the Lord
They shall want no good thing now, and have much goodness laid up for them to be enjoyed hereafter; the sun of righteousness rises upon them, and a book of remembrance is written on their account; the Lord delights in them, his eye is upon them; and they are blessed with more grace now, and will be blessed with glory hereafter.

Both small and great ;
young and old, rich and poor, high and low, lesser or greater believers; be they children, young men, or fathers; see (Revelation 11:18) .