Numbers 35:23 (BSB)

or without looking drops a heavy stone that kills him, but he was not an enemy and did not intend to harm him,

From Numbers 35. Also in the ESV.

Commentary on Numbers 35:23

• John Gill (Reformed Baptist), Exposition of the Old and New Testaments on Numbers 35:23: Or with any stone wherewith a man may die,.... Which is sufficient to kill a man, if thrown at him: seeing him not; and so without intention: the Jews (s) from hence gather, that a blind man is to be acquitted and dismissed, and not banished and so stands in no need of a city of refuge; though others say he is to be banished...
• Keil & Delitzsch (Lutheran), Biblical Commentary on the Old Testament on Numbers 35:20-23: Num 35:20-23 And so also the man who hit another in hatred, or threw at him by lying in wait, or struck him with the hand in enmity, so that he died. And if a murderer of this kind fled into a free city, the elders of his city were to have him fetched out and delivered up to the avenger of blood (Deu 19:11-12).