출애굽기 21:19 해설: Tze'enah Ure'enah, Rashi, Chizkuni & Ramban

“Has to take to bed” [21:19]. When a person beats his friend with his fists or with a stone and he takes to bed, and as a result cannot do his work. The aggressor is put in prison until he is healed. However, in any event he has to pay what he would have earned during the illness. If he chopped off a hand or a foot, then they value what the hand or foot is worth to a person and he should pay for the hand or the foot. They value the work that he could have done during the illness, when he is without hand or foot. That is, he can at least guard a garden, then he must pay him what someone who guards a garden is paid.¹⁹Ramban, Exodus, 21:24.

על משענתו (lit., with that on which he relies) — i. e. his former healthy state and vigour (Mekhilta; cf. Onkelos).

אם יקום והתהלך בחוץ, “if he (the person who had been knocked to the ground) gets up and walks outside the house unaided;” if that person takes to his bed and does not even partially recover, so that he dies before having been able to walk, the party that knocked him down will be tried for murder (and executed if he had been duly warned by witnessing observing the fight).