Contradiction with Proverbs 21:13
Proverbs states that those who ignore the poor will not be heard, while Job 31:20 portrays Job as someone whose generosity causes others to bless him.
Proverbs 21:13: Whoso stoppeth his ears at the cry of the poor, he also shall cry himself, but shall not be heard.
Contradiction with Luke 6:38
This verse suggests giving results in receiving more, in contrast with Job 31:20 where Job claims his giving has not led to selfish gain but rather to authentic blessings from those helped.
Luke 6:38: Give, and it shall be given unto you; good measure, pressed down, and shaken together, and running over, shall men give into your bosom. For with the same measure that ye mete withal it shall be measured to you again.