1 Samuel 26:4-6

4 So David dispatched spies and determined that Sha’ul had definitely come.

5 David set out and went to where Sha’ul had pitched his camp. He saw where Sha’ul and Avner the son of Ner, the commander of his army, were sleeping. Sha’ul was lying inside the barricade with the troops asleep all around him.

6 David said to Achimelekh the Hitti and Avishai the son of Tz’ruyah, Yo’av’s brother, “Who will go down with me to Sha’ul in the camp?” Avishai said, “I will go down with you.”