15 Then Hushai said to Zadok and to Abiathar the priests, “Ahithophel counseled Absalom and the elders of Israel that way; and I have counseled this way. 16 Now therefore send quickly, and tell David, saying, ‘Don’t lodge this night at the fords of the wilderness, but by all means pass over; lest the king be swallowed up, and all the people who are with him.’” 17 Now Jonathan and Ahimaaz were staying by En Rogel; and a female servant used to go and tell them; and they went and told king David. For they might not be seen to come into the city. 18 But 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. 19 The woman took and spread the covering over the well’s mouth, and spread out bruised grain on it; and nothing was known. 20 Absalom’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. 21 It happened, after they had departed, that 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.”
Matthew Henry's Commentary on 2 Samuel 17:15-21
Commentary on 2 Samuel 17:1-21
(Read 2 Samuel 17:1-21)
Here was a wonderful effect of Divine Providence blinding Absalom's mind and influencing his heart, that he could not rest in Ahithophel's counsel, and that he should desire Hushai's advice. But there is no contending with that God who can arm a man against himself, and destroy him by his own mistakes and passions. Ahithophel's former counsel was followed, for God intended to correct David; but his latter counsel was not followed, for God meant not to destroy him. He can overrule all counsels. Whatever wisdom or help any man employs or affords, the success is from God alone, who will not let his people perish.