The Torah legislates the case of a master who strikes his servant, specifying that the servant must "die under his hand." The Mekhilta dissects this phrase to extract a precise legal requirement: both the striking and the dying must occur within the master's domain of ownership.
The practical scenario the text addresses is this: a master strikes his servant, and then, before the servant dies, the master sells him to someone else. The servant subsequently dies from the injuries inflicted by the first master. Is the original master liable under the provisions of the Torah's law?
The Mekhilta says no. Once the servant has been sold, the chain of legal responsibility is broken. The verse requires that the servant "die under his hand," meaning under the hand and authority of the one who struck him. If the servant died under the authority of a new master, the original striker is not subject to the specific penalty outlined in the Torah for killing a servant.
This ruling might seem like a technicality, but it reflects a deeper legal principle. The Torah's criminal penalties require precise conditions to be met. The law does not operate on general impressions of guilt. It demands that every element of the verse be satisfied before punishment is imposed. The striking and the dying must align in time, in place, and in the relationship between the parties.
The Mekhilta's interpretation protects the integrity of the legal system by insisting on exactitude. Even in cases of obvious moral culpability, the Rabbis would not extend a penalty beyond the specific conditions the Torah itself established.