וָאֵרֵ֞ד לְהַצִּיל֣וֹ ׀ מִיַּ֣ד מִצְרַ֗יִם וּֽלְהַעֲלֹתוֹ֮ מִן־הָאָ֣רֶץ הַהִוא֒ אֶל־אֶ֤רֶץ טוֹבָה֙ וּרְחָבָ֔ה אֶל־אֶ֛רֶץ זָבַ֥ת חָלָ֖ב וּדְבָ֑שׁ אֶל־מְק֤וֹם הַֽכְּנַעֲנִי֙ וְהַ֣חִתִּ֔י וְהָֽאֱמֹרִי֙ וְהַפְּרִזִּ֔י וְהַחִוִּ֖י וְהַיְבוּסִֽי׃
и я пришел спасти их от руки египтян и вывести их из той земли в добрую и большую землю, в землю, в которой течет молоко и мед; до места Ханаана, и Хеттеянина, и Аморита, и Перизита, и Хивитянина, и Иевусеянина.
Ramban
AND I AM COME DOWN TO DELIVER THEM. That is, “for I have revealed Myself in fire on this mountain.” This has the same meaning as in the verses: And the Eternal came down upon Mount Sinai;163Further, 19:20. Because the Eternal descended upon it in fire.164Ibid., Verse 18. It may be that [the expression come down has the same meaning here] as in the verse, I will go down now, and see whether they have done altogether according to the cry of it, which is come unto Me.165Genesis 18:21. See Ramban there (Vol. I, p. 245) where he explains that the meaning is, “I will go down from the attribute of mercy to the attribute of justice.” Here the meaning would be: “and I am come down from attribute to attribute.” I have already explained its secret there.
Rashbam
וארד, to this bush in order to speak to you so as to save them from the Egyptians.