daf bit: Menachot 29
Rav Yehudah said in the name of Rav: when Moshe ascended Sinai to receive torah he found God affixing crowns to certain of the letters. (If you look in a sefer torah you'll see ornaments on the tops of some letters. That's what this is referring to.) Moshe asked: Master of the universe, is there anything wanting in torah that these crowns are necessary? God replied: after many generations a scholar named Akiva ben Yosef will expound upon each one of these crowns. Moshe replied: Master of the universe, please let me see this man! God said: turn around.
Moshe sat down behind eight rows of students and listened to Rabbi Akiva teach, but Moshe couldn't follow the arguments, which disturbed him. Then on one subject a disciple asked: how do we know it? Rabbi Akiva said: it is a law given to Moshe at Sinai. Comforted, Moshe returned to God and said: you have such a man as he and yet you give torah through me instead? God replied: be silent, for this is my decree. (Many tellings of this midrash end here.)
Moshe then said: Master of the universe, you have shown me his torah -- now please show me his reward. Turn around, said God, and Moshe saw them weighing out his flesh in the marketplace. Moshe protested: such torah, and such a reward?! God replied: be silent, for this is my decree. (29b)
(Akiva is one of the ten martyrs we read about on Yom Kippur. He famously died with the Sh'ma on his lips.)
no subject
But boy did it pack a wallop when I learned there was more to the story later.