1 Samuel 22:20-22

Brenton(i) 20 And one son of Abimelech son of Achitob escapes, and his name was Abiathar, and he fled after David. 21 And Abiathar told David that Saul had slain all the priests of the Lord. 22 And David said to Abiathar, I knew it in that day, that Doec the Syrian would surely tell Saul: I am guilty of the death of the house of thy father.