Exodus 21:12

מכה איש ומת WHOSOEVER SMITETH A MAN SO THAT HE DIE [SHALL SURELY BE PUT TO DEATH] — Many apparently redundant verses have been written in various sections of the Torah dealing with murderers and I shall explain to the best of my ability why all these statements have been made. מכה איש ומת WHOSOEVER SMITETH A MAN SO THAT HE DIE — Why is this said (how does the particular form of words used here tell us some point of law which is not contained in another text bearing upon the same subject)? Since it is said, (Leviticus 24:17) “And the man that smiteth (יכה) any person (more lit., the soul of any human being) [shall surely be put to death]”, I might have inferred that mere smiting without resultant death is subject to the death penalty. Scripture therefore states here, “Whosoever smiteth a man so that he die [shall surely be put to death]”, thus telling you that he is not punishable with death unless the stroke proves fatal. On the other hand if it had stated here, “Whosoever smiteth a man…” and it had not said there “If a man smiteth [any person]”, I might have inferred that the murderer is not guilty except if he killed “a man”; whence, however, could I know that he is subject to the death penalty if he killed a woman or a minor? Therefore Scripture states “And if [a man] smiteth any person”, thus including even a minor and a woman. Then again: if it had stated only, “Whosoever smiteth a man” I might have inferred that even a minor who smote and killed a person is punishable with death. Scripture therefore states “and if a man smiteth” — a man but not a minor. Then on the other hand, so far as concerns the statement “And if [a man] smiteth the soul of any man” it might be held that even premature births at a term of eight months are included in the term כל נפש אדם “soul of any man”, Scripture therefore states “Whosoever smiteth a man” to intimate that one is not subject to the death penalty unless he kills a viable child — one which is fitted to become a man (Mekhilta).

מַכֵּ֥ה אִ֛ישׁ וָמֵ֖ת מ֥וֹת יוּמָֽת׃

He that smites a man, so that he die, shall be surely put to death.