Numbers 35:18 (BSB)

If anyone has in his hand a deadly object of wood, and he strikes and kills another, he is a murderer; the murderer must surely be put to death.

From Numbers 35. Also in the ESV.

Commentary on Numbers 35:18

• John Gill (Reformed Baptist), Exposition of the Old and New Testaments on Numbers 35:18: Or if he smote him with an hand weapon of wood,.... A stick, or staff, or club: wherewith he may die, and he die; which is sufficient to kill a man, as the same Targum explains it; and a man dies with the blow that is given him by it: he is a murderer, and the murderer shall surely be put to death; no pardon...
• Keil & Delitzsch (Lutheran), Biblical Commentary on the Old Testament on Numbers 35:16-18: Num 35:16-18 Special instructions are given in Num 35:16-28, with reference to the judicial procedure. First of all (Num 35:16-21), with regard to qualified slaying or murder. If any person has struck another with an iron instrument (an axe, hatchet, hammer, etc.), or “with a stone of the hand, from which one dies,” i.e., with a stone which filled the hand, - a large stone...