I will bring you to the land, concerning which I raised My hand to give to Abraham, to Isaac, and to Jacob, and I will give it to you as a heritage; I am the L-rdThe Or HaChaim HaKadosh raises a problem with this verse. This verse encompasses a divine promise to Am Yisrael to bring them into the Land of Israel. The verses preceding it also are promises to Am Yisrael, comprising: I will take you out, I will save you, I will redeem you, I will take you. The problem is that Hashem didn't bring these people out of Egypt and then into Eretz Yisrael, most of them died in the desert. Furthermore these verses are introduced by the phrase "Therefore, say to the children of Israel (לָכֵן אֱמֹר לִבְנֵי יִשְׂרָאֵל) (Shmot 6:6)", which Rashi says "Therefore (לכן)" means "according to that oath", implying that all of these promises are in a framework of a divine oath.
וְהֵבֵאתִי אֶתְכֶם אֶל הָאָרֶץ אֲשֶׁר נָשָׂאתִי אֶת יָדִי לָתֵת אֹתָהּ לְאַבְרָהָם לְיִצְחָק וּלְיַעֲקֹב וְנָתַתִּי אֹתָהּ לָכֶם מוֹרָשָׁה אֲנִי ה' -ה
Shmot 6:8
So, asks the Or HaChaim, how can Hashem make such a promise, a divine oath when it is known that this is not carried out?