Contradiction with Exodus 20:14
This verse contradicts 1 Samuel 18:21 by forbidding adultery, whereas in 1 Samuel 18:21, Saul offers his daughter Michal to David, which indirectly involves deception and manipulation.
Exodus 20:14: Thou shalt not commit adultery.
Contradiction with Matthew 5:37
This verse contradicts 1 Samuel 18:21 by instructing to let your communication be simple and truthful, while 1 Samuel 18:21 involves Saul's deceitful intentions under the guise of giving his daughter in marriage.
Matthew 5:37: But let your communication be, Yea, yea; Nay, nay: for whatsoever is more than these cometh of evil.
Contradiction with James 1:13
This verse contradicts 1 Samuel 18:21 by stating that God does not tempt anyone to do evil, yet in 1 Samuel 18:21, Saul is tempting David with marriage to his daughter as part of a plot against him.
James 1:13: Let no man say when he is tempted, I am tempted of God: for God cannot be tempted with evil, neither tempteth he any man: [evil: or, evils]
Paradox #1
The contradiction or conflict could arise from the intention behind marriage. In this verse, a marriage proposal is used as a strategy for harm or manipulation, which contrasts with the usual belief that marriage should be based on love and mutual respect. The underlying intention conflicts with the values expected in relationships.