Then thou shalt be a burden unto me - It appears that Hushai was not a warrior, but was a wise, prudent, and discreet man, who could well serve David by gaining him intelligence of Absalom's conspiracy; and he directs him to form a strict confederacy with the priests Zadok and Abiathar, and to make use of their sons as couriers between Jerusalem and David's place of retreat.

Unto whom David said,.... After he had heard what he had to say, and what tidings he brought:

and if thou passest on with me; in his march and flight:

then thou shalt be a burden to me; being to be maintained by him; and David having but scanty provisions, and so could not receive useless persons, as Hushai might be, perhaps an old man, that could be of no service to him, and unfit for travelling, and so would rather be an hinderance than an help unto him.

Unto whom David said, If thou passest on with me, then thou shalt be a burden unto me:

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.