Contradiction with Matthew 21:21
This verse suggests that faith as small as a mustard seed can accomplish great things, which contrasts with the apostles' request for increased faith in Luke 17:5.
Matthew 21:21: Jesus answered and said unto them, Verily I say unto you, If ye have faith, and doubt not, ye shall not only do this [which is done] to the fig tree, but also if ye shall say unto this mountain, Be thou removed, and be thou cast into the sea; it shall be done.
Contradiction with James 1:6-8
These verses indicate that one must have unwavering faith, contrasting with the apostles' implication that their faith is insufficient.
James 1:6-8: But let him ask in faith, nothing wavering. For he that wavereth is like a wave of the sea driven with the wind and tossed.
Contradiction with Mark 9:23
This verse asserts that all things are possible to him who believes, contradicting the apostles' request for greater faith in Luke 17:5.
Mark 9:23: Jesus said unto him, If thou canst believe, all things [are] possible to him that believeth.
Contradiction with Matthew 17:20
This passage states that faith as small as a mustard seed can move mountains, opposing the idea in Luke 17:5 that more faith is necessary.
Matthew 17:20: And Jesus said unto them, Because of your unbelief: for verily I say unto you, If ye have faith as a grain of mustard seed, ye shall say unto this mountain, Remove hence to yonder place; and it shall remove; and nothing shall be impossible unto you.