Absalom came into Jerusalem - It is very probable that he and his partisans were not far from the city when David left it, and this was one reason which caused him to hurry his departure.

Reader, behold in the case of David a sad vicissitude of human affairs, and a fearful proof of their instability. Behold a king, the greatest that ever lived, a profound politician, an able general, a brave soldier, a poet of the most sublime genius and character, a prophet of the Most High God, and the deliverer of his country, driven from his dominions by his own son, abandoned by his fickle people, and for a time even by his God! See in his desolate state that there is none so exalted that God cannot abase, and none so abased that God cannot exalt. He was forsaken for a time, and his enemies triumphed; God returned, and his enemies were confounded. His crime, it is true, was great and God had declared by Nathan what had now come to pass. God is just, and in numberless instances sees right to show his displeasure even at those sins which his mercy has forgiven. In all cases it is a fearful and bitter thing to sin against the Lord.

So Hushai David's friend came into the city,.... The city of Jerusalem, by the direction and persuasion of David, and in obedience to him, in order to serve him to the uttermost:

and Absalom came into Jerusalem: just at the same time; so that he knew not that Hushai had been out of it, and been with David, and which also appears from what he said to him, 2 Samuel 16:17.

So Hushai went into the city when Absalom came to Jerusalem. The w before the second clause, followed by the imperfect יבוא, indicates contemporaneous occurrence (vid., Ewald, 346, b.).

So Hushai David's friend came into the city, and Absalom came into Jerusalem.

15:37 Absalom came, and c. - How soon do royal cities and royal palaces change their masters? But we look for a kingdom which cannot be moved.

15:31-37 David prays not against Ahithophel's person, but against his counsel. He prayed this, in firm belief that God has all hearts in his hand, and tongues also. But we must second our prayers with endeavours, and David did so, else we tempt God. But we do not find wisdom and simplicity so united in any mere man, that we can perceive nothing which needs forgiveness. Yet, when the Son of David was treated with all possible treachery and cruelty, his wisdom, meekness, candour, and patience, were perfect. Him let us follow, cleave to, and serve, in life and in death.