The gemara here in Yoma is discussing showing kavod for the Beis Hamikdash, or the shechinah, or one's rebbi, by backing away when leaving instead of turning one's back. It brings an incident when Rava would back away from Rav Yosef, until his feet hit the door jamb and began dripping blood. Rav Yosef heard about it (he was blind), and declared that Rava would eventually become Rosh Yeshiva.
The neat thing is that there is a very similar story in the Matan Torah gemara of Shabbos 88a, where the same Rava was learning Torah, not realizing that his hands were caught somehow, until they began to drip blood. A heretic was furious with him, and compared it to Israel's נעשה ונשמע at Matan Torah...
The neat thing is that there is a very similar story in the Matan Torah gemara of Shabbos 88a, where the same Rava was learning Torah, not realizing that his hands were caught somehow, until they began to drip blood. A heretic was furious with him, and compared it to Israel's נעשה ונשמע at Matan Torah...