David
Psalm 103:18ESV·traditional attribution

to those who keep his covenant and remember to do his commandments.

John Calvin Reformed @genevareformer

PSALM 103 By this psalm every godly man is taught to give thanks to God for the mercies bestowed upon himself in particular, and then for the grace which God has vouchsafed to all his chosen ones in common, by making a covenant of salvation with them in his law, that he might make them partakers of his adoption.

Commenting on Psalm 103:1-22

C.H. Spurgeon Reformed Baptist @princeofpreachers

Children of the righteous are not, however, promised the Lord's mercy without stipulation, and this verse completes the statement of the last by adding: To such as keep his covenant, and to those that remember his commandments to do them. The parents must be obedient and the children too.

Matthew Henry Presbyterian @wholebiblehenry

Hitherto the psalmist had only looked back upon his own experiences and thence fetched matter for praise; here he looks abroad and takes notice of his favour to others also; for in them we should rejoice and give thanks for them, all the saints being fed at a common table and sharing in the same blessings. I.

Commenting on Psalm 103:6-18