1 Samuel 15:35
And Samuel came no more to see Saul until the day of his death: nevertheless Samuel mourned for Saul: and the Lord repented that he had made Saul king over Israel.
Cross-references
1 Samuel 15:11
Historical context
1 Samuel 15:11 records God's regret and Samuel's anger, the immediate cause of his mourning here.
1 Samuel 16:1
Historical context
1 Samuel 16:1 continues the story — God tells Samuel to stop mourning and anoint David.
1 Samuel 19:24
Contrast
1 Samuel 19:24 shows Saul prophesying before Samuel, seemingly contradicting the claim he never saw him again.
Genesis 6:6
Parallel
Genesis 6:6 shows God regretting creation due to human wickedness — same divine grief as regretting making Saul king.
Jeremiah 18:10
Parallel
In Jeremiah 18:10, God states He will relent of intended good if people do evil — the same principle behind His regret over making Saul king.