2 Samuel 17:16

“See, I am going to wait at the fords of the wilderness until word comes from you to inform me.”

“Are not Zadok and Abiathar the priests with you there? So it shall be that whatever you hear from the king’s house, you shall inform Zadok and Abiathar the priests.

Now it happened after they went away, that they came up out of the well and went and informed King David; and they said to David, “Arise and cross over the water quickly for thus Ahithophel has counseled against you.”