2 Samuel 17:19

17Now Jonathan and Ahimaaz were staying by En Rogel; and a female servant used to go and report to them, and they went and told King David; for they couldn’t risk being seen coming into the city.

18But a boy saw them, and told Absalom. Then they both went away quickly and came to the house of a man in Bahurim, who had a well in his court; and they went down there.

19The woman took and spread the covering over the well’s mouth, and spread out crushed grain on it; and nothing was known.

20Absalom’s servants came to the woman to the house; and they said, “Where are Ahimaaz and Jonathan?” The woman said to them, “They have gone over the brook of water.” When they had sought and could not find them, they returned to Jerusalem.

21After they had departed, they came up out of the well and went and told King David; and they said to David, “Arise and pass quickly over the water; for thus has Ahithophel counseled against you.”