Reference for Taanit 50:15
ולשמואל הקטן שבחו של צבור היכי דמי אמר משיב הרוח ונשב זיקא אמר מוריד הגשם ואתא מיטרא:
Let thy waters spring forth', as it is said, The flow appear on the earth etc.<span class="x" onmousemove="('comment',' Cant. II, 12. The verse is taken to point to the resurrection of nature as the result of the rain. [The verse continues, 'and the voice of the ru, ru, turtle () is heard in our land'. is taken in its Aramaic sense of 'ox', thus alluding to Ridya's resemblance to a three years' old heifer.]');"><sup>13</sup></span> IF WHILST THEY ARE FASTING RAIN FALLS, IF IT IS BEFORE SUNRISE etc. Our Rabbis have taught: If whilst they are fasting rain falls, if it is before sunrise they need not complete the fast; if it is after sunr they must complete it; this is the opinion of R'Meir.