24 Then the congregation shall judge between the slayer and the revenger of blood according to these judgments:

25 And the congregation shall deliver the slayer out of the hand of the revenger of blood, and the congregation shall restore him to the city of his refuge, whither he was fled: and he shall abide in it unto the death of the high priest, which was anointed with the holy oil.

26 But if the slayer shall at any time come without the border of the city of his refuge, whither he was fled;

27 And the revenger of blood find him without the borders of the city of his refuge, and the revenger of blood kill the slayer; he shall not be guilty of blood:

28 Because he should have remained in the city of his refuge until the death of the high priest: but after the death of the high priest the slayer shall return into the land of his possession.

29 So these things shall be for a statute of judgment unto you throughout your generations in all your dwellings.

30 Whoso killeth any person, the murderer shall be put to death by the mouth of witnesses: but one witness shall not testify against any person to cause him to die.

31 Moreover ye shall take no satisfaction for the life of a murderer, which is guilty of death: but he shall be surely put to death.

32 And ye shall take no satisfaction for him that is fled to the city of his refuge, that he should come again to dwell in the land, until the death of the priest.

33 So ye shall not pollute the land wherein ye are: for blood it defileth the land: and the land cannot be cleansed of the blood that is shed therein, but by the blood of him that shed it.

34 Defile not therefore the land which ye shall inhabit, wherein I dwell: for I the Lord dwell among the children of Israel.

Highlighted phrases are interesting.

I can't help but think this prefigured Christ dying for our sins. That there is no atonement except through Christ our high priest.

John Gill writes...

and he shall abide in it, unto the death of the high priest, which was anointed with the holy oil: and then he was to be set at liberty, and return to his house and family and have his former possessions and honours, if he had any, restored unto him, the commission or warrant for his detainer there ceasing, being made void by the death of the high priest; who was the prince of the priests and Levites, to whom those cities belonged, and so under his jurisdiction: or so it was ordered, because such was the general mourning for such a public loss as an high priest, that all private revenges would subside, and the cause of them be buried, in grief and forgetfulness;

though, no doubt, this had a respect to something which will be hereafter taken notice of: the Jews say (u), that the mothers of the priests used to supply with a sufficient quantity of food and raiment such who fled to the cities of refuge, that they might not pray for the death of their sons; and according to them, a man's case was very bad when there was no high priest; for so they write(w)"he whose cause is finished (or his case determined in a court of judicature), and there is no high priest; and he that slays an high priest, or an high priest slays another, he never goes out, no not so much as to bear testimony in any cause, and even in what the congregation has need of him, but there are his dwelling, his death, and his burial.''

Numbers 35:28

Because he should have remained in the city of his refuge until the death of the high priest,.... Nothing could give him his liberty but his death; so that though this was a merciful provision made in such cases for such persons, and was a considerable benefit and privilege, yet it carried in it some appearance of a punishment; since such a person was confined within the boundaries of one of the cities of refuge as long as the high priest lived; and this was done to make persons cautious how they were any way accessory to the death of another, though without design:

but after the death of the high priest the slayer shall return into the land of his possession; to that part of the land, and to that tribe to which he belonged, to his house and family, and to his possessions and inheritances, whatever he had, and to all the honours and privileges he before enjoyed, and under no danger from the avenger of blood henceforward: a custom somewhat like this has prevailed in some parts of Africa, as Leo Africanus (y) relates, that if a man happened to kill another, all the friends of the deceased conspired to kill him, but if they could not effect it, then the guilty person was proclaimed an exile from the city, for the whole space of seven years; and at the expiration of the whole seven years, when he returned from his exile, the chief men of the city invited him to a feast, and so he was restored to his liberty: temples, groves, altars, and statues, were common among other nations for asylums or refuges, but whole cities very rarely with the ancients; it seems there were some (z).

(y) Descriptio Africae, l. 2. p. 135, 136. (z) Vid. Marmor. Oxon. & Not. in ib. p. 25. & Rittershusium de Jure Asylorum, c. 2.

Numbers 35:32

Moreover, ye shall take no satisfaction for him that is fled to the city of his refuge,.... Though for killing a man unawares:

that he should come again to dwell in the land, until the death of the priest; the high priest; such a man's liberty was not to be purchased with money, nor even his life to be bought off, should he be taken without his city; a great ransom could not deliver him from the avenger, because he was guilty of this law, which so wisely and mercifully provided for him; and consequently guilty also of great ingratitude to God, as well as of a breach of his law, and of disrespect to his high priest, under whom he was protected.

Numbers 35:33

So ye shall not pollute the land wherein ye are,.... The land of Canaan, as it had been by the old inhabitants of it, by idolatry, adultery, and murder:

for blood it defileth the land: the shedding of innocent blood defiles a nation, and the inhabitants of it, brings guilt thereon, and subjects to punishment:

and the land cannot be cleansed of the blood that is shed therein, but by the blood of him that shed it; or "there can be no expiation" (b), or "atonement made" for it in any other way; the blood of the murderer is required at his hands, and nothing short of it will satisfy law and justice, see Gen 9:6.

(b) לא יכפר "non posset expiatio", Junius & Tremellius, Piscator; to the same sense Pagninus, Montanus, Tigurine version.