The justice system established by the Torah places an absolute boundary on the sanctity of life. When a life is taken, the resulting penalty cannot be bargained away or converted into a financial transaction. The primary prohibition is accepting any form of ransom, such as a bribe or financial payout, from a person who has killed accidentally. Just as an intentional murderer is forbidden from buying his way out of a death sentence, an accidental killer cannot pay to escape the mandatory penalty of exile in a City of Refuge. This warning is directed first and foremost at judges. They must not dare to accept bribes to lighten a killer's sentence, whether by falsely classifying an intentional murder as an accident or by granting an exiled person permission to return home prematurely [נתינה לגר].
The exact nature of the killer's attempt to avoid exile is a matter of discussion. The primary approach among commentators, led by [רש"י] and supported by [שד"ל], is that the law addresses a person who has already fled to a City of Refuge. This is logically supported by the killer's desire to return home, a desire that only makes sense if he has already left. Conversely, other commentators view the situation as an attempt to avoid the exile entirely. In this view, a person sentenced to exile tries to pay a ransom to remain in his own city and never flee at all [בכור שור]. To address the logical difficulty of how such a person could be described as wanting to return home if he never left, [הטור הארוך] and [מלבי"ם] explain that any killer will naturally run to the City of Refuge immediately to escape the anger of the victim's family. The forbidden ransom, therefore, is a payment designed to let the killer stay in the refuge city only temporarily until the family's anger calms down, after which he would return home. Furthermore, the prohibition applies to taking a ransom for the act of fleeing itself, even if the killer's only goal is to return home before the death of the High Priest [רש"ר הירש].
The Cities of Refuge are designed exclusively for those who kill by accident. If an intentional murderer attempts to use these cities, or even God's altar, as a safe haven, it is permitted and even required to forcefully remove him to face execution. This occurred historically when Joab tried to save himself from a death sentence by holding onto the corners of the altar [דעת זקנים].
Beyond the immediate context of murder and exile, these concepts teach additional laws. The idea of an illicit return teaches that a ransom cannot be accepted from a Hebrew slave who has reached the end of his service but insists on returning to a degraded state of servitude [תורה תמימה]. Additionally, the requirement to dwell in the land highlights the eternal nature of the exile and the need for complete atonement, even after death. If an accidental killer dies while living in the City of Refuge, he must be buried there. His bones may only be moved and reburied in his ancestral family plots after the High Priest dies, as this final burial represents his ultimate dwelling in the land [בכור שור, תורה תמימה]. The obligation to fulfill this exile is so profound and absolute that if a person dies or escapes before completing his time, his soul will reincarnate and return to the world to pay the remaining debt [שפתי כהן].