Matthew Henry's Concise Commentary on the Bible - Numbers 35:9-34
9-34 To show plainly the abhorrence of murder, and to provide the more effectually for the punishment of the murderer, the nearest relation of the deceased, under the title of avenger of blood, (or the redeemer of blood,) in notorious cases, might pursue, and execute vengeance. A distinction is made, not between sudden anger and malice aforethought, both which are the crime of murder; but between intentionally striking a man with any weapon likely to cause death, and an unintentional blow. In... read more
George Haydock's Catholic Bible Commentary - Numbers 35:33
Defile not. To inspire a greater horror for murder the earth was represented as defiled by blood, and only to be purified by the death of the criminal. Without shedding of blood, there is no remission, Hebrews ix. 22. (Haydock) --- On the same principle, our churches, &c., are deemed profane when murder, or some great indecencies, have been committed in them, so that they require a fresh consecration. (Calmet) read more