John Gill Commentary 1 Samuel 22:11

"Then the king sent to call Ahimelech the priest, the son of Ahitub, and all his father`s house, the priests that were in Nob: and they came all of them to the king." — 1 Samuel 22:11 (ASV)

Then the king sent to call Ahimelech the priest, the son of Ahitub Sent messengers to him, and summoned him to appear before him:

and all his father's house ; the family of Eli, which God had threatened to destroy, and now the time was hastening on:

the priests that [were] in Nob ; in which dwelt none but priests, at least these were the chief of the inhabitants, and therefore called the city of the priests, (1 Samuel 22:19);

and they came all of them to the king ; not being conscious of any evil they had committed, or that could be charged upon them; or otherwise they would not have appeared, but would have fled to David for protection.