1 Samuel 22:19

While the holy man David was on the run from Saul's persecution, he fled to a place where he thought he would be safe. He passed by the house of a priest named Ahimelech and accepted loaves from him. In so doing, he acted in the role not of a king only, but of a priest too, because he ate the bread of the presence which "it was unlawful for anyone other than the priests to eat," as the Lord reminds us in the Gospel. Saul, when later he began to hunt him, was angry with his retainers because none of them was willing to betray David. The story has just been read from the book of the Kingdoms [Samuel]. But there was a man present that day named Doeg, who was an Edomite and the principal herdsman in Saul's service; he too had come to Ahimelech the priest. He was present again when Saul raged against his followers because none of them would betray David. Doeg revealed where he had seen him. Saul immediately sent for the priest and all his family to be brought before him, and [he] ordered that they be killed. Not one of Saul's entourage dared raise a hand against the priests of the Lord, even under orders from the king. But this Doeg, who had betrayed David's whereabouts, was like Judas; he did not recoil from his evil purpose but persisted in bringing forth fruit from that same root even to the end, the kind of fruit typical of a rotten tree. So at the king's order Doeg killed the priest and all his family, and afterwards the city of the priests was demolished.We have seen, then, that this man Doeg was the enemy of both David the king and Ahimelech the priest. Doeg was a single person, but he represents a whole class of people. Similarly David embodies both king and priest, like one man with a dual personality, though the human race is one. […]

Indeed, when Saul heard that the priests had helped David unwittingly, he had them brought to him, and he killed them. It was fitting for you too that innocent blood be hung about your neck, as was Saul's case. But the Son of David escaped …

You put in the front of your letter what would be pleasing, that it is written in the book of 1 Kings [Samuel]: "Samuel served as a boy before the Lord, girded in a linen ephod and having a small duplicate cloak which his mother had made for him and would bring to him day after day when she went up with her husband to offer sacrifice on the day of sacrifice."

When David was fleeing from Saul, he came to the priest Abimelech. He was received by him and obtained the loaves of proposition and the sword with which he had slain Goliath. The loaves of proposition denoted his role as priest, the consecrated sword his …

Now he struck the city of the priests with the edge of the sword, etc. With the doctors of Christ slaughtered by the Antichrist, he also seeks to utterly disgrace and eradicate their fame of doctrine, by which they used to courageously combat impious dogma …