Just off hand, look in Kesubos 106A where Rav Yosef said that because of decrease in the number of talmidim in comparison to the generation of Elisha he can not daven for a yeshua. Look in perush Rashi on Yeshayah 10:27 that the salvation from Sancheriv came because of increase in limud ha’Torah. Look in Bava Basra 7B that talmidei chachomim are pturim from the defence taxes as their Torah protects them. There is a Gemorah or a Medrash I don’t remember where that one talmid chocham protects 40,000 others. There is a Gemorah in Shabbos, perek Be’ma Madlikin that Malach ha’Moves could not attack Dovid ha’Melech as long as he was learning. When you are done, come for more.
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