Rashi on Deuteronomy 13:13/רש"י על דברים י״ג:י״ג

1לשבת שם [IF THOU SHALT HEAR SAY IN THE CITIES WHICH THE LORD THY GOD HATH GIVEN THEE] TO ABIDE THERE — The words “to abide there” are added to exclude Jerusalem which city was not intended as a dwelling-place (Sifrei Devarim 92:5; cf. Bava Kamma 82b).

2כי תשמע לאמור IF THOU SHALT HEAR … SAYING means, if thou shalt hear people saying thus: “[Certain men, worthless persons,] have gone out” etc.