Doeg the Edomite

"I saw the son of Jesse coming to Nob, to Ahimelech the son of Ahitub."

- Doeg telling Saul David's location. Doeg the Edomite was, according to the Book of Samuel, chief herdsman to King Saul of Israel.

Villainy
After David son of Jesse, a member of Saul's court, fled from Saul's attempts to kill him, he went to hide in the city of Nob, where he was fed and given the sword of Goliath by the high priest Ahimelech. However, Ahimelech was seen by Doeg the Edomite, who told Saul that David was in Nob. Saul then summoned Ahimelech and the rest of the priests, and asked them why they conspired against him. Ahimelech denied conspiracy, but Saul rejected his claims and ordered his men to kill him. They refused, so Saul turned to Ahimelech, who proceeded to kill Ahimelech and all the other priests. Saul then attacked Nob, destroying it and killing everyone except David and high priest Abiathar, who managed to escape. This is the last time that Doeg is mentioned, aside from in Psalm 52, in which David condemns his actions and says that God will punish him.