וְשָׁלַחְתִּ֥י לְפָנֶ֖יךָ מַלְאָ֑ךְ וְגֵֽרַשְׁתִּ֗י אֶת־הַֽכְּנַעֲנִי֙ הָֽאֱמֹרִ֔י וְהַֽחִתִּי֙ וְהַפְּרִזִּ֔י הַחִוִּ֖י וְהַיְבוּסִֽי׃
Aku akan mengutus seorang malaikat di depanmu, dan Aku akan menghalau orang Kanaan, orang Amori, orang Het, orang Feris, orang Hewi, dan orang Yebus —
Rashi
וגרשתי את הכנעני וגו׳ AND I WILL DRIVE OUT THE CANAANITE etc. — These are only six nations whilst in Deuteronomy 7:1 seven such are mentioned! But the Girgashites, the seventh, arose and emigrated of their own accord from before them (the Israelites) and therefore are not mentioned here amongst those who were driven out (Jerusalem Talmud Shevi'it 6:2; Leviticus Rabbah 17:6).
Sforno
ושלחתי לפניך מלאך, the very angel who introduces himself to Joshua (Joshua 5,14) as the שר צבא ה', “Commander in Chief of G’d’s hosts.”
Or HaChaim
ושלחתי לפניך מלאך, "and I will send an angel ahead of you, etc." It is clear from this verse that up until now G'd had meant for Moses personally to lead the children of Israel into the Holy Land and to distribute it to them. We have a line in Exodus 6,1 where G'd told Moses: עתה תראה "now you will see," and many commentators understood this to mean that Moses would be a witness only to the Exodus from Egypt but not to the conquest of the land of Canaan. Perhaps G'd had cancelled that decree in consideration of how Moses had interceded on behalf of the Jewish people, putting his own future on the line.