1 Samuel 13:13

13:13 Then Samuel said to Saul, “You have made a foolish choice! You have not obeyed the commandment that the Lord your God gave you. Had you done that, the Lord would have established your kingdom over Israel forever!

1 Samuel 15:2

15:2 Here is what the Lord of hosts says: ‘I carefully observed how the Amalekites opposed Israel along the way when Israel came up from Egypt.

1 Samuel 15:23

15:23 For rebellion is like the sin of divination,

and presumption is like the evil of idolatry.

Because you have rejected the word of the Lord,

he has rejected you as king.”