Contradiction with Exodus 20:16
Exodus 20:16 commands not to bear false witness, contradicting the deceptive environment Isaac is in residing among the Philistines in Genesis 26:6.
Exodus 20:16: Thou shalt not bear false witness against thy neighbour.
Contradiction with Matthew 5:37
Jesus teaches to let your communication be 'Yea, yea; Nay, nay,' promoting honesty, which contrasts the potential need for deception in Genesis 26:6.
Matthew 5:37: But let your communication be, Yea, yea; Nay, nay: for whatsoever is more than these cometh of evil.
Contradiction with Colossians 3:9
Advises against lying to one another, which is contrary to the subterfuge implied in Genesis 26:6.
Colossians 3:9: Lie not one to another, seeing that ye have put off the old man with his deeds;
Contradiction with Proverbs 12:22
States that lying lips are an abomination to the Lord, as opposed to any deceptive practices that Genesis 26:6 might entail under different cultural norms.
Proverbs 12:22: Lying lips [are] abomination to the LORD: but they that deal truly [are] his delight.
Contradiction with John 8:32
Promotes living by the truth, which contrasts with the possible need for concealment or dishonesty depicted in the broader narrative of Genesis 26.
John 8:32: And ye shall know the truth, and the truth shall make you free.