Parashas Masei · Passuk 35:11 · TT note 4
Chabad.org — English translation + Rashi
Torah Temimah points to Makkos 7b (TT note on “בִּשְׁגָגָה”).
English: “Unintentionally” — excluding one who says [the act] is permitted, who does not go into exile.
Halakhic exclusion — one who acts under the mistaken belief that the act is permitted is not subject to exile.
True shogeg that triggers exile is accidental performance of a known prohibition; one who thought the act was permitted (omer muttar) is not sent to a city of refuge.