Cyrill of Alexandria
If a person commits unintentional homicide, the law prescribes a punishment of perpetual exile, moderating this penalty with an element of compassion, wisely distinguishing between accidental and deliberate offenses. It was instructed to designate three cities, referred to as havens (Deuteronomy 4:41 ff.), where those who have committed unintentional acts can seek refuge. Additionally, the period of atonement for them is specified; it is linked to the passing of the high and chief priest.
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As recorded in the book of Numbers: "If he should push him unintentionally, without enmity, or should throw something on him without intent, or should drop a stone that could cause death, without realizing it, and it results in the death of another, but he is not his enemy and did not desire harm, then the community shall adjudicate between the unintentional killer and the avenger of blood according to these regulations; and the community shall protect the unintentional killer from the avenger of blood and restore him to the city of refuge where he fled, so he may reside there until the death of the anointed high priest" (further elaboration found in Num. 35:28).