It happened, when Abiathar the son of Ahimelech fled to David to Keilah, that he came down with an ephod in his hand.
"We have just witnessed how Saul, in an outburst of rage, became responsible for the destruction of the priestly city of Nob. In ch. 23, David, even while on the run from Saul, is shown saving a city from Philistine attack." [Note: Gordon, I & II Samuel . . ., p. 175.] 