I once saw it in some sefer that Rabbi Akiva saw Bar Kochba sleeping on his back (not on his side) and then he knew that he wasn't Mashiach. Does anyone know where this is written? I'm pretty sure its ...
What is the source, and the reason, for the widespread custom of singing the last Mishnah in Yoma on Lag B'Omer? Also, why do people, when singing this on Lag B'Omer, skip part of the song (put in ...