1 Samuel 22:23

Abide thou with me, fear not: for he that seeketh my life seeketh thy life: but with me thou shalt be in safeguard.

Cross-reference

1 Kings 2:26 shows Solomon sparing Abiathar because he shared David's hardships — fulfilling David's promise of safekeeping here.

John 15:20 echoes the same principle: those who persecute the master will persecute the servant — exactly what David tells Abiathar here.