2 Samuel 17:17-21

(17) Now Jonathan and Ahimaaz stayed by Enrogel; for they might not be seen to come into the city: and a wench went and told them; and they went and told king David. (18) Nevertheless a lad saw them, and told Absalom: but they went both of them away quickly, and came to a man's house in Bahurim, which had a well in his court; whither they went down. (19) And the woman took and spread a covering over the well's mouth, and spread ground corn thereon; and the thing was not known. (20) And when Absalom's servants came to the woman to the house, they said, Where is Ahimaaz and Jonathan? And the woman said unto them, They be gone over the brook of water. And when they had sought and could not find them, they returned to Jerusalem. (21) And it came to pass, after they were departed, that they came up out of the well, and went and told king David, and said unto David, Arise, and pass quickly over the water: for thus hath Ahithophel counselled against you.

Here we behold a renewed instance of the LORD's overruling power. It would be incredible, but for this, to account how it was that Absalom's suspicion had not been more excited by the departure of the two sons of Zadok and Abiathar. And the least suspicion would have ruined the whole plan, and involved Hushai, Zadok, and all the priests at Jerusalem in it. But the scripture before us explains all: The LORD had appointed to bring evil upon Absalom. Awful, when men are given up to a deluded blindness! See that instance of Eli's sons; 1 Samuel 2:25.