Contradiction with Matthew 6:31
This verse emphasizes not being concerned about what to eat, possibly contradicting the urgency shown by Sarah in preparing food for guests in Genesis 18:6.
Matthew 6:31: Therefore take no thought, saying, What shall we eat? or, What shall we drink? or, Wherewithal shall we be clothed?
Contradiction with Luke 10:41-42
Jesus' response to Martha suggests that being overly concerned with serving food (as Sarah was) is less important than listening to Him.
Luke 10:41-42: And Jesus answered and said unto her, Martha, Martha, thou art careful and troubled about many things:
Contradiction with Romans 14:17
This verse implies that the kingdom of God is not about eating and drinking, which may contradict the focus on food preparation in Genesis 18:6.
Romans 14:17: For the kingdom of God is not meat and drink; but righteousness, and peace, and joy in the Holy Ghost.