Contradiction with Psalms 146:3
It advises not to put trust in princes or the son of man, in contrast to trusting in man's help described in Psalms 124:2.
Psalms 146:3: Put not your trust in princes, [nor] in the son of man, in whom [there is] no help. [help: or, salvation]
Contradiction with Jeremiah 17:5
It states that curses come from trusting in man, opposing the helpful view of man in Psalms 124:2.
Jeremiah 17:5: Thus saith the LORD; Cursed [be] the man that trusteth in man, and maketh flesh his arm, and whose heart departeth from the LORD.
Contradiction with Psalms 118:8
It suggests that trusting in the Lord is better than trusting in man, indirectly conflicting with the affirmation in Psalms 124:2.
Psalms 118:8: [It is] better to trust in the LORD than to put confidence in man.
Contradiction with Isaiah 2:22
It advises to cease from man, implying a lack of value in man's help contrary to Psalms 124:2.
Isaiah 2:22: Cease ye from man, whose breath [is] in his nostrils: for wherein is he to be accounted of?