Jamieson-Fausset-Brown on Numbers 35:22
But if he thrust him suddenly without enmity, or have cast upon him any thing without laying of wait, &c.--Under the excitement of a sudden provocation, or violent passion, an injury might be inflicted issuing in death; and for a person who had thus undesignedly committed slaughter, the Levitical cities offered the benefit of full protection. Once having reached the nearest, for one or other of them was within a day's journey of all parts of the land, he was secure. But he had to "abide in it." His confinement within its walls was a wise and salutary rule, designed to show the sanctity of human blood in God's sight, as well as to protect the manslayer himself, whose presence and intercourse…
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The revenger of blood - גאל הדם goel haddam, the redeemer of blood; the next in blood to him who was slain. See on Num 35:12 (note).
John Gill on Numbers 35:22
But if he thrust him suddenly, without enmity,.... Push him from a precipice, before he is aware, without any malicious design against his life, but merely through accident:
or have cast upon him anything; from the top of a house, or from a building he is pulling down, or pushes a bowing wall upon him, not knowing that he is passing by it:
and without lying of wait: or having contrived to do it, just as he goes along, or in any other similar way.
John Calvin on Numbers 35:9–end
Numbers 35:9-34
9. And the Lord spoke unto Moses, saying,
9. Et locutus est Jehova ad Mosen dicendo:
10. Speak unto the children of Israel, and say unto them, When ye be come over Jordan into the land of Canaan,
10. Alloquere filios Israel, et dicas eis, Quum transieritis Jordanem in terra Chanaan,
11. Then ye shall appoint you cities to be cities of refuge for you; that the slayer may flee thither, which killeth any person at unawares.
11. Constituetis vobis urbes: urbes autem refugii erunt vobis, quo fugiet homicida qui percusserit aliquem per errorem.
12. And they shall be unto you cities for refuge from the avenger; that the manslayer die not, until he stand before the congregati…