Charles Ellicott Commentary Psalms 129:4

"Jehovah is righteous: He hath cut asunder the cords of the wicked." — Psalms 129:4 (ASV)

The Lord is righteous.—This expression of faith, introduced without any conjunction, is itself a revelation of the deeply-rooted religion of Israel.

Cords.—Literally, cord. As in Psalm 124:7, the net was broken and the bird escaped, so here the cord binding the slave is severed and he goes free.