One of the sons of Ahimelech, the son of Ahitub, named Abiathar, escaped, and fled after David.
"Abiathar escaped and fled after David"  (1 Samuel 22:20).  We are not told just how this escape came about; but the general supposition is that he was left in attendance at the altar while all the rest of the priests answered Saul's summons.  In the following chapter we shall see that Abiathar became a very important member of David's staff of advisers.