Contradiction with Proverbs 26:11
Contradicts the forgiving nature of God in Luke 15:3 by depicting a fool repeating his folly.
Proverbs 26:11: As a dog returneth to his vomit, [so] a fool returneth to his folly. [returneth to his folly: Heb. iterateth his folly]
Contradiction with Matthew 7:6
Contrasts with the idea of seeking the lost in Luke 15:3 by advising against giving what is holy to dogs or casting pearls before swine.
Matthew 7:6: Give not that which is holy unto the dogs, neither cast ye your pearls before swine, lest they trample them under their feet, and turn again and rend you.
Contradiction with Galatians 6:7
Emphasizes reaping what one sows, contrasting with the unmerited grace depicted in Luke 15:3.
Galatians 6:7: Be not deceived; God is not mocked: for whatsoever a man soweth, that shall he also reap.