John Calvin Commentary Psalms 103:6

"Jehovah executeth righteous acts, And judgments for all that are oppressed." — Psalms 103:6 (ASV)

Jehovah executeth righteousness. David, having recounted the Divine benefits bestowed upon him, now moves from this personal consideration to take a wider view of the subject. There is, however, no doubt that when he declares God to be the helper of the oppressed, he includes himself among them, for he had enjoyed God's help during many persecutions; and from his own experience, he describes the manner in which God customarily reveals Himself to all who are unjustly afflicted.

Since the faithful are always living among wolves in this world, he uses the plural to celebrate a variety of deliverances, thereby teaching us that it is God’s ordinary work to help His servants whenever He sees them wrongfully treated. Therefore, we are taught to exercise patience, understanding that God takes it upon Himself to avenge our wrongs. He covers us with the shield of His justice or defends us with the sword of His judgment whenever we are wrongfully assaulted.