וּמָצָ֤א אֹתוֹ֙ גֹּאֵ֣ל הַדָּ֔ם מִח֕וּץ לִגְב֖וּל עִ֣יר מִקְלָט֑וֹ וְרָצַ֞ח גֹּאֵ֤ל הַדָּם֙ אֶת־הָ֣רֹצֵ֔חַ אֵ֥ין ל֖וֹ דָּֽם׃
et que le vengeur du sang, le rencontrant hors des limites de son asile, tue le meurtrier, il ne sera point punissable.
Tosefta Terumot
The slave of a priest who escaped, or the wife of a priest who rebelled, behold, they may [nonetheless] eat terumah. And the [inadvertent] killer may not go outside the border of his sanctuary city (Num. 35:27) due to the presumption that that the High Priest is still alive.