1 Samuel 26:4-6

4 David therefore sent out spies, and understood that Saul definitely came.

5 And David arose, and came to the place where Saul had encamped. And David beheld the place where Saul lay, and Abner the son of Ner, the captain of his army. And Saul lay within the place of the wagons, and the people were encamped around about him.

6 Then David answered and said to Ahimelech the Hittite, and to Abishai the son of Zeruiah, brother to Joab, saying, Who will go down with me to Saul to the camp? And Abishai said, I will go down with thee.