2 Samuel 4:7

For when they came into the house, he lay on his bed in his bedchamber, and they smote him, and slew him, and beheaded him, and took his head, and gat them away through the plain all night.

When they came into the house, he lay on his bed. Rechab and Baanah came in the heat of the day, when they knew that Ish-bosheth, their master, would, according to custom, be resting on his divan; and as it was necessary, for the reason just given, to have the grain the day before it was needed, their coming at that time, though it might be a little earlier than usual, created no suspicion, and attracted no notice. They took advantage of these circumstances to execute an infamous plot they had formed against the life of their master; and having assassinated him while reposing on his couch, they cut off his head, to be carried as a trophy to David in Hebron.

Gat them away through the plain all night, х haa-`Araabaah (H6160)] - i:e., the valley of the Jordan, through which their way lay from Mahanaim to Hebron.