“And Abiathar told David that Saul had killed the Lord’s priests” (1 Samuel 22:21 NKJV).

Abiathar, son of the high priest, Ahimelech, must have been left behind to care for the sanctuary when Saul called for his father’s attendance. When he heard that Saul had killed all the Lord’s priests, he fled to David.
 
Saul had falsely accused Ahimelech of “inquiring of the Lord” to aid David against him. But now by killing the Lord’s priests, he had actually driven Abiathar to David’s side, bringing the ephod, with the Urim and Thummim, with him (1 Sam. 23:6).
 
Saul’s killing of the priests was one of the most heinous acts of any Israelite king. It revealed his heart’s rejection of the Lord. Saul’s foot soldiers, who ran beside his chariot, refused to carry out his order to murder the priests. They feared the Lord, but Saul knew one who did not. So, Saul called on Doeg the Edomite to kill them. Doeg turned and killed not only the 85 priests, but went to their city and killed every living thing including women, children and nursing infants. That Saul would stoop to instruct an Edomite, to even touch the Lord’s priests, showed the insane hatred he had for the true king, David.
 
Centuries later, the son of an Edomite named Herod became king over Israel as a vassal of Rome. After hearing of the birth of the prophesied Son of David from the Magi, he murdered every baby boy under 2 years of age in Bethlehem attempting to kill Jesus. But he failed, for the Lord protected Jesus, just as the Lord protected David.