Contradiction with Proverbs 3:24
Job 15:21 speaks of terrors, whereas Proverbs 3:24 promises peace and a lack of fear during sleep.
Proverbs 3:24: When thou liest down, thou shalt not be afraid: yea, thou shalt lie down, and thy sleep shall be sweet.
Contradiction with 2 Timothy 1:7
Job 15:21 describes fearfulness, while 2 Timothy 1:7 declares God has given a spirit of power and sound mind, not fear.
2 Timothy 1:7: For God hath not given us the spirit of fear; but of power, and of love, and of a sound mind.
Contradiction with Psalm 34:4
Job 15:21 depicts fearfulness, but Psalm 34:4 states that seeking the Lord delivers from all fears.
Psalm 34:4: I sought the LORD, and he heard me, and delivered me from all my fears.