Numbers 35:23

21 or if in hostility he strikes him with his hand and he dies, the one who struck him must surely be put to death; he is a murderer. When the avenger of blood finds the murderer, he is to kill him.

22 But if anyone pushes a person suddenly, without hostility, or throws an object at him unintentionally,

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

24 then the congregation must judge between the slayer and the avenger of blood according to these ordinances.

25 The assembly is to protect the manslayer from the hand of the avenger of blood. Then the assembly will return him to the city of refuge to which he fled, and he must live there until the death of the high priest, who was anointed with the holy oil.

This was said to Israel at a particular time, so it is wise to read it together with the surrounding text. Do read the surrounding verses too, because the context often says more than a single verse.

Compare

BSB
or without looking drops a heavy stone that kills him, but he was not an enemy and did not intend to harm him,
KJV
Or with any stone, wherewith a man may die, seeing him not, and cast it upon him, that he die, and was not his enemy, neither sought his harm:
WEB
or with any stone, by which a man may die, not seeing him, and cast it on him so that he died, and he was not his enemy and not seeking his harm,
ASV
or with any stone, whereby a man may die, seeing him not, and cast it upon him, so that he died, and he was not his enemy, neither sought his harm;
DARBY
or [have smitten him] with any stone wherewith one may die, without seeing him, and have cast it upon him so that he die, and he was not his enemy, neither sought his harm:
BLB
or with any stone with which a man could die by it, without seeing [him], and throwing [it] at him so that he dies, and he [is] not an enemy to him or seeking his harm,
ÅB
eller uten å se ham rammer ham med en stein stor nok til å drepe en med, så han dør, men drapsmannen ikke er hans fiende og ikke vil ham noe ondt,
OTB
eller, uten å se dem, slipper en stein tung nok til å forårsake død, og personen dør, men det var ingen fiendskap og ingen skade ment,
B1930
eller uten å se ham rammer ham med en sten stor nok til å drepe en med, så han dør, men drapsmannen ikke er hans fiende og ikke vil ham noget ondt,

Study notes (Tyndale)

Original text and word study