Reference for Taanit 47:17

רב נחמן גזר תעניתא בעא רחמי ולא אתא מיטרא אמר שקלוה לנחמן חבוטו מן גודא לארעא חלש דעתיה ואתא מיטרא

is unobtainable but I take the trouble to procure for myself wine for Kiddush and Habdalah and thus help also others to fulfil their duty. Once Rab came to a certain place and decreed a fast but no rain fell. The Reader then stepped down at his request before the ark and recited, 'He causeth the wind to blow', and the wind blew; [he continued], 'He causeth the rain to fall', and rain fell. Rab thereupon asked him, What is your special merit?

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