Babylonian Talmud, Moed Katan, 28a

Rava said: Life, children, and food do not depend on merit; rather, they depend on luck. For Rabbah and Rav Hisda were two righteous rabbis - one would pray and rain would come, and the other would pray and rain would come. [Yet] Rav Hisda lived 92 years and Rabbah lived [only] 40 years. In the house of Rav Hisda there were 60 marriages; in the house of Rabbah, 60 deaths. In the house of Rav Hisda, there was pure wheat bread for dogs, and they did not want. In the house of Rabbah, there was even a lack of [poor quality] barley bread for people. [Translation by Uri L’Tzedek]