Contradiction with Isaiah 45:7
This verse suggests that God creates both peace and evil, which contradicts the implication in Matthew 13:27 that an enemy is responsible for sowing tares.
Isaiah 45:7: I form the light, and create darkness: I make peace, and create evil: I the LORD do all these [things].
Contradiction with Luke 6:44
This verse implies that a tree (or person) can only produce one kind of fruit corresponding to its nature, contradicting the mixed outcome (wheat and tares) in Matthew 13:27.
Luke 6:44: For every tree is known by his own fruit. For of thorns men do not gather figs, nor of a bramble bush gather they grapes. [grapes: Gr. a grape]