Parashas Masei · Passuk 35:28 · TT note 1
Chabad.org — English translation + Rashi
Torah Temimah points to Makkos 12b (TT note on “כִּי בְעִיר מִקְלָטוֹ יֵשֵׁב”).
English: It was taught: A murderer who killed [again] in that same city goes into exile from neighborhood to neighborhood. Rav Acha son of Rav Ika said: What is the verse? “For he shall dwell in his city of refuge” — a city that has already absorbed him.
Intra-city exile when a second killing occurs inside the city of refuge.
Even after reaching a city of refuge, a further unintentional killing there requires the killer to move to another neighborhood within the same city.