And David said to Abiathar, “I knew on that day, when Doeg the Edomite was there, that he would surely tell Saul. I have occasioned the death of all the persons of your father’s house.
Here is, 1. The escape of Abiathar, the son of Ahimelech, out of the desolations of the priests' city. Probably when his father went to appear, upon Saul's summons, he was left at home to attend the altar, by which means he escaped the first execution, and, before Doeg and his bloodhounds came to Nob, he had intelligence of the danger, and had time to shift for his own safety.
Commenting on 1 Samuel 22:20-23
Abide thou with me, fear not,.... He appeared to be in a fright; which is not to be wondered at, as not knowing what to do, and where to go and provide for his safety; when, to allay his fears, and make him easy, David invites and encourages him to stay with him, and not be afraid of Saul, nor any other: for he that...
I knew it that day - When I saw Doeg there, I suspected he would make the matter known to Saul. I have occasioned the death of all the persons - I have been the innocent cause of their destruction.