C. F. Keil and Franz Delitzsch on Exodus 21:18-19

Exo 21:18-19

If in the course of a quarrel one man should hit another with a stone or with his fist, so that, although he did not die, he “lay upon his bed,” i.e., became bedridden; if the person struck should get up again and walk out with his staff, the other would be innocent, he should “only give him his sitting and have him cured,” i.e., compensate him for his loss of time and the cost of recovery. This certainly implies, on the one hand, that if the man died upon his bed, the injury was to be punished with death, according to Exo 21:12; and on the other hand, that if he died after getting up and going out, no further punishment was to be inflicted for the injury done.