"For on the day you eat of it you shall surely die" (Genesis 2:17). [The doubled wording "die you shall die" teaches:] death for Adam, death for Eve, death for him [in this generation], and death for his descendants.
On the Day You Eat You Shall Surely Die
Yalkut Shimoni on Torah 22:8
(בראשית ב יז) כִּי בְּיוֹם אֲכָלְךָ מִמֶּנּוּ מוֹת תָּמוּת. מִיתָה לְאָדָם, מִיתָה לְחַוָּה, מִיתָה לוֹ, מִיתָה לְתּוֹלְדוֹתָיו.