יהושע ו:יז פירוש: רש״י

And the city shall be consecrated. It shall be sacred, for that day was the holy Shabbos,³See Rashi to verse 15. Radak maintains that Yehoshua issued this edict by Divine ordination, but also mentions that the Sages were of the opinon that Yehoshua issued this edict on his own. and it was therefore fitting that all the booty that was taken be holy.