Verse 3
Ahiah, the son of Ahitub - Phinehas, son of Eli the high priests had two sons, Ahitub and I-chabod; the latter was born when the ark was taken, and his mother died immediately after. Ahiah is also called Ahimelech, 1Sam 22:9.
Wearing an ephod - That is, performing the functions of the high priest. This man does not appear to have been with Saul when he offered the sacrifices, 1Sam 13:9, etc.