2 Samuel 3:26

Sent messengers after Abner. — Whether this was done in his own or in David’s name (though without his knowledge) does not appear, but in either case Abner would readily suppose that the coming of Joab had made further conference desirable. His entire confidence in David is shown by his unsuspecting return.

The well of Sirah. — The only knowledge of this locality is from the testimony of Josephus (Antt. vii. 1, 5), that it was twenty stadia (two and a half miles) from Hebron; and there is still a spring and reservoir called Ain Sareh, rather more than a mile north of the town. If this is correct, Abner must have just left David when Joab arrived.