Haggahot Ya'avetz on Avot D'Rabbi Natan Chapter 29
Can copy this into an AI, or connect the whole library to your assistant. For deeper learning, you can directly use the original seforim, sites, and apps.
מפני מה ת״ח מתים בלא זמנם. נ״ב עי׳ פירושו לעיל [פכ״ו]: