Contradiction with Ecclesiastes 1:14
While Psalms 126:3 speaks of great things done by the Lord, Ecclesiastes 1:14 suggests that all works under the sun are vanity.
Ecclesiastes 1:14: I have seen all the works that are done under the sun; and, behold, all [is] vanity and vexation of spirit.
Contradiction with Lamentations 3:17
Psalms 126:3 focuses on joy and blessings, whereas Lamentations 3:17 reflects on the lack of peace and the absence of happiness.
Lamentations 3:17: And thou hast removed my soul far off from peace: I forgat prosperity. [prosperity: Heb. good]
Contradiction with Job 30:26
Psalms 126:3 proclaims joy for good deeds, meanwhile, Job 30:26 expresses an expectation of good met with evil and darkness.
Job 30:26: When I looked for good, then evil came [unto me]: and when I waited for light, there came darkness.
Contradiction with Habakkuk 1:2
While Psalms 126:3 acknowledges God's marvelous works, Habakkuk 1:2 questions why God does not promptly save or listen to cries of distress.
Habakkuk 1:2: O LORD, how long shall I cry, and thou wilt not hear! [even] cry out unto thee [of] violence, and thou wilt not save!
Contradiction with Isaiah 59:2
Psalms 126:3 speaks of the great things the Lord has done, but Isaiah 59:2 highlights how sins can separate people from God, preventing His blessings from reaching them.
Isaiah 59:2: But your iniquities have separated between you and your God, and your sins have hid [his] face from you, that he will not hear. [have hid: or, have made him hide]