John Gill Reformed Baptist @doctorgill

But if the slayer shall at any time come without the border of the city of his refuge,.... Which seems to be the three thousand cubits assigned to every city of the Levites, and so to the cities of refuge; and which, according to the Jewish writers, were a refuge, as the city itself; and it is said (x),"he, that kills a man there, is...

Keil & Delitzsch Lutheran @keilanddelitzsch

Num 35:26-28 If he left the city of refuge before this, and the avenger of blood got hold of him, and slew him outside the borders (precincts) of the city, it was not to be reckoned to him as blood (דּם לו אין, like דּמים לו אין, Exo 22:1).

Commenting on Numbers 35:26-28