Albert Barnes Commentary Psalms 146:7

"Who executeth justice for the oppressed; Who giveth food to the hungry. Jehovah looseth the prisoners;" — Psalms 146:7 (ASV)

Which executeth judgment for the oppressed - This is the third reason why those who trust in God are happy. It is because He has power to pronounce and execute a right judgment or sentence concerning the oppressed and the wronged, and because it is characteristic of His nature that He does so execute judgment. See the notes at (Psalms 103:6): The Lord executeth righteousness and judgment for all that are oppressed.

Which giveth food to the hungry - This is the fourth reason why those who confide in God are happy. See the notes at (Psalms 107:9): For he satisfieth the longing soul, and filleth the hungry soul with goodness. Compare (Luke 1:53): He hath filled the hungry with good things.

The Lord looseth the prisoners - This is the fifth reason why those who trust in the Lord are happy. Compare the notes at (Psalms 68:6): He bringeth out those which are bound with chains. See also the notes at (Psalms 107:10): Being bound in affliction and iron. Compare (Job 36:8–9).