Contradiction with Proverbs 12:22
Lies are abomination to the Lord, contradicting their honest claim in Genesis 43:20.
Proverbs 12:22: Lying lips [are] abomination to the LORD: but they that deal truly [are] his delight.
Contradiction with Exodus 20:16
Commandment against bearing false witness conflicts with any deceit in Genesis 43:20.
Exodus 20:16: Thou shalt not bear false witness against thy neighbour.
Contradiction with Matthew 5:37
Encourages straightforward honesty, in contrast to any mixed story in Genesis 43:20.
Matthew 5:37: But let your communication be, Yea, yea; Nay, nay: for whatsoever is more than these cometh of evil.
Contradiction with Proverbs 19:9
Warns against false witness, relates to sincerity of Genesis 43:20.
Proverbs 19:9: A false witness shall not be unpunished, and [he that] speaketh lies shall perish.
Contradiction with Colossians 3:9
Urges not to lie to one another, potentially in conflict with Genesis 43:20's implications.
Colossians 3:9: Lie not one to another, seeing that ye have put off the old man with his deeds;