Commentary for Numbers 35:18
א֡וֹ בִּכְלִ֣י עֵֽץ־יָד֩ אֲשֶׁר־יָמ֨וּת בּ֥וֹ הִכָּ֛הוּ וַיָּמֹ֖ת רֹצֵ֣חַֽ ה֑וּא מ֥וֹת יוּמַ֖ת הָרֹצֵֽחַ׃
Or if he smote him with a weapon of wood in the hand, whereby a man may die, and he died, he is a murderer; the murderer shall surely be put to death.
Rashi on Numbers
או בכלי עץ יד OR [IF HE SMITE HIM] WITH A WEAPON OF WOOD IN HIS HAND — Because it has been stated, (Exodus 21:20) “And if a man smite his bondman or his bondwoman with a rod”, one might think that it means whatever size it may be! Therefore it states here of the wooden instrument אשר ימות בה — meaning that it must have a size sufficient to cause death (Sifrei Bamidbar 160:4).
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