וְלֹא־תִקְח֣וּ כֹ֔פֶר לָנ֖וּס אֶל־עִ֣יר מִקְלָט֑וֹ לָשׁוּב֙ לָשֶׁ֣בֶת בָּאָ֔רֶץ עַד־מ֖וֹת הַכֹּהֵֽן׃
Também não aceitareis resgate por aquele que se tiver acolhido à sua cidade de refúgio, a fim de que ele possa tornar a habitar na terra antes da morte do sumo sacerdote.
Sifrei Bamidbar
(Bamidbar 35:32) "And you shall not take ransom for one who fled to the city of his refuge, etc.": If one killed unwittingly, I might think that if he gave money (i.e., "ransom"), he would not be exiled. It is, therefore, written "And you shall not take ransom for one who has fled, etc."