Doeg in the Bible Encyclopedia - ISBE

do'-eg (do'-egh "anxious," "cared for"): "The Edomite," a servant of Saul, who watched David's intercourse with the priest Ahimelech, then denounced the priest to the king, and later executed his command to slay the priests at Nob. The position he held is described as that of "the mightiest" of Samuel's herdsmen (1 Sam 21:7 margin). Septuagint reads: "tending the mules." Rabbinical legends speak of him as the greatest scholar of his time. The traditional title of Ps 52 associates the composition of that Psalms with the events that led to the slaying of the priests (1 Sam 21:7; 22:9,18,22).