וְנָתַתִּ֣י לְ֠ךָ וּלְזַרְעֲךָ֨ אַחֲרֶ֜יךָ אֵ֣ת ׀ אֶ֣רֶץ מְגֻרֶ֗יךָ אֵ֚ת כָּל־אֶ֣רֶץ כְּנַ֔עַן לַאֲחֻזַּ֖ת עוֹלָ֑ם וְהָיִ֥יתִי לָהֶ֖ם לֵאלֹהִֽים׃
און איך װעל געבן דיר און דײַן זאָמען נאָך דיר דאָס לאַנד פֿון דײַן װױנשאַפֿט, דאָס גאַנצע לאַנד כּנַעַן, פֿאַר אַן אײביקן אײגנטום; און איך װעל זײ זײַן צום גאָט.
Rashi
לאחזת עולם FOR AN EVERLASTING POSSESSION — and there I will be your God; but whoever resides outside the land is as if he has no God (Ketubot 110b).
Radak
ונתתי ... את ארץ מגורך, a reference to the locations in which Avraham had dwelled, not only these but the whole of the land of Canaan.
Sforno
לאחוזת עולם, "I will be your G'd in order that you may carry out My will, and He gave them the land presently belonging to other nations in order that they keep His statutes." (Psalms 105, 44-45) When they do this they will achieve eternal existence individually, not merely as a species.