Chasidut sobre I Reyes 1:1

And Hashem appeared to him etc (Genesis 18:1) - we have to explain first the verse "And Avraham was old, entered in days" (Genesis 24:1). Behold, the upper worlds are called "days" and the tzadik in their kedusha reaches up to the upper worlds, and this is "Avraham was old/zaken" as in "this one acquired wisdom"/Zeh Kanah chochmah" (Sifra, Kedoshim 7:12); "entered in days" meaning, until he reached the upper worlds, and so too about King David, peace be upon him, it was said "And David was old, entered in days etc" (I Kings 1:1) and this is "He asked from You life; You granted him many days" (Ps. 21:5). That behold regarding the tzadik, the life they have in this world is not his, rather, it is as a borrowed thing for one hour, and because of this the tzadik goes and strengthens themself always in holiness, since the tzadik always thinks that lest today it will be the day of returning what was borrowed, and this is "he asked from You life", meaning, meaning, the tzadik who thinks that life is only borrowed from You, therefore "You granted him many days", through this the tzadik merits many days, which are the life in the world to come.