2 Samuel 17:15-19

15Hushai told Zadok and Abiathar, the priests, “Ahithophel has advised Absalom and the elders of Israel to do such and such, but I have advised them to do so and so.

16Now send a message at once and tell David, ‘Do not spend the night at the fords in the wilderness; cross over without fail, or the king and all the people with him will be swallowed up.’ ” 17Jonathan and Ahimaaz were staying at En Rogel. A female servant was to go and inform them, and they were to go and tell King David, for they could not risk being seen entering the city. 18But a young man saw them and told Absalom. So the two of them left at once and went to the house of a man in Bahurim. He had a well in his courtyard, and they climbed down into it.

19His wife took a covering and spread it out over the opening of the well and scattered grain over it. No one knew anything about it.