(Devarim 20:15) "Thus shall you do to all the cities that are distant": The distant ones (i.e., those not of the seven nations) are subsumed in this law (to spare the women and children), but those that are near (i.e., the seven nations) are not subsumed in this law.
(Ibid. 17) "But you shall utterly destroy them": I might think that their spoil were forbidden to you; it is, therefore, written (Ibid. 6:11) "and houses full of all good." "the Chitti, the Emori, the Canaani, etc."
(דברים כ טו) כֵּן תַּעֲשֶׂה לְכָל הֶעָרִים הָרְחֹקֹת, הָרְחוֹקוֹת בַּתּוֹרָה הַזֹּאת וְאֵין הַקְּרוֹבוֹת בַּתּוֹרָה הַזֹּאת.
(Devarim 20:15) "Thus shall you do to all the cities that are distant": The distant ones (i.e., those not of the seven nations) are subsumed in this law (to spare the women and children), but those that are near (i.e., the seven nations) are not subsumed in this law.
אֲשֶׁר לֹא מֵעָרֵי הָעַמִּים הֵמָּה, אֵין עָרֵי הַגּוֹיִם הָאֵלֶּה בַּתּוֹרָה הַזֹּאת. (דברים כ טז) ״רַק מֵעָרֵי הָעַמִּים הָאֵלֶּה לֹא תְחַיֶּה כָּל נְשָׁמָה״ – בְּסַיִף.
(Ibid. 16) "But from the cities of these people (the seven nations) … you shall not allow any soul to live": (But you shall slay them) by the sword.
(דברים כ יז) כִּי הַחֲרֵם תַּחֲרִימֵם, יָכוֹל תְּהֵא בִּזָּתָם אֲסוּרָה לְךָ? תַּלְמוּד לוֹמַר (דברים ו יא): ״וּבָתִּים מְלֵאִים כָּל טוּב״.
(Ibid. 17) "But you shall utterly destroy them": I might think that their spoil were forbidden to you; it is, therefore, written (Ibid. 6:11) "and houses full of all good." "the Chitti, the Emori, the Canaani, etc."
הַחִתִּי וְהָאֱמֹרִי הַכְּנַעֲנִי וְהַפְּרִזִּי הַחִוִּי וְהַיְבוּסִי, כְּשֶׁהוּא אוֹמֵר כַּאֲשֶׁר צִוְּךָ ה׳ אֱלֹהֶיךָ – לְרַבּוֹת אֶת הַגִּרְגָּשִׁי.
"as the L-rd your G-d commanded you": to include the Girgashi.