Contradiction with Numbers 23:19
This verse states that God does not change His mind, whereas 1 Samuel 15:10 suggests a change in God’s decision regarding Saul.
Numbers 23:19: God [is] not a man, that he should lie; neither the son of man, that he should repent: hath he said, and shall he not do [it]? or hath he spoken, and shall he not make it good?
Contradiction with Malachi 3:6
This verse emphasizes that God does not change, yet in 1 Samuel 15:10, God expresses regret for making Saul king.
Malachi 3:6: For I [am] the LORD, I change not; therefore ye sons of Jacob are not consumed.
Contradiction with James 1:17
This verse describes God as unchanging, in contrast to the implication of regret or change in God's perspective in 1 Samuel 15:10.
James 1:17: Every good gift and every perfect gift is from above, and cometh down from the Father of lights, with whom is no variableness, neither shadow of turning.
Contradiction with Hebrews 13:8
This verse states that Jesus Christ is the same always, implying divine constancy, contrary to 1 Samuel 15:10 where God seems to alter His stance concerning Saul.
Hebrews 13:8: Jesus Christ the same yesterday, and to day, and for ever.