Contradiction with Acts 10:15
This verse states that what God has cleansed should not be called common or unclean, which could be seen as opposing the idea of needing sanctification through prayer and the word as mentioned in 1 Timothy 4:5.
Acts 10:15: And the voice [spake] unto him again the second time, What God hath cleansed, [that] call not thou common.
Contradiction with Matthew 15:11
This verse suggests that what goes into the mouth does not defile a man, contrary to 1 Timothy 4:5's implication that food requires sanctification.
Matthew 15:11: Not that which goeth into the mouth defileth a man; but that which cometh out of the mouth, this defileth a man.
Contradiction with Mark 7:18-19
Jesus declares all foods clean, which could contradict the notion in 1 Timothy 4:5 that food needs to be sanctified.
Mark 7:18-19: Because it entereth not into his heart, but into the belly, and goeth out into the draught, purging all meats?
Contradiction with Romans 14:14
States that nothing is unclean in itself, potentially contradicting the idea of requiring sanctification in 1 Timothy 4:5.
Romans 14:14: I know, and am persuaded by the Lord Jesus, that [there is] nothing unclean of itself: but to him that esteemeth any thing to be unclean, to him [it is] unclean. [unclean: Gr. common]
Contradiction with Colossians 2:16
Advises not to let others judge you in food or drink, which might contrast with the implication in 1 Timothy 4:5 that sanctification is necessary.
Colossians 2:16: Let no man therefore judge you in meat, or in drink, or in respect of an holyday, or of the new moon, or of the sabbath [days]: [in meat...: or, for eating and drinking] [respect: or, part]