Parashas Vaeira
וְגַ֨ם הֲקִמֹ֤תִי אֶת־בְּרִיתִי֙ אִתָּ֔ם לָתֵ֥ת לָהֶ֖ם אֶת־אֶ֣רֶץ כְּנָ֑עַן אֵ֛ת אֶ֥רֶץ מְגֻרֵיהֶ֖ם אֲשֶׁר־גָּ֥רוּ בָֽהּ׃
I also established My covenant with them, to give them the land of Canaan, the land in which they lived as sojourners.
Torah Temimah points to R’ Simai — Sanhedrin 90b (verified).
לתת להם — תנא, ר׳ סמאי אומר: מניין לתחיית המתים מן התורה, שנאמר וגם הקמותי את בריתי אתם לתת להם את ארץ כנען — לכם לא נאמר אלא להם.
English: “To give them the land” — it was taught, R’ Simai says: From where [do we know] the resurrection of the dead from the Torah? As it is said, “And I also established My covenant with them to give them the land of Canaan” — it does not say “to you” but “to them.”
Custom
Chazal derive the resurrection of the dead from the wording “to give them the land.”