The Gemara deduced from the parallel use of the word "appear" in and (regarding appearance offerings) on the one hand, and in (regarding the great assembly) on the other hand, that the criteria for who participated in the great assembly also applied to limit who needed to bring appearance offerings. A Baraita deduced from the words "that they may hear" in that a deaf person was not required to appear at the assembly. And the Baraita deduced from the words "that they may learn" in that a mute person was not required to appear at the assembly. But the Gemara questioned the conclusion that one who cannot talk cannot learn, recounting the story of two mute grandsons (or others say nephews) of Rabbi Johanan ben Gudgada who lived in Rabbi's neighborhood. Rabbi prayed for them, and they were healed. And it turned out that notwithstanding their speech impediment, they had learned halachah, Sifra, Sifre, and the whole Talmud. Mar Zutra and Rav Ashi read the words "that they may learn" in to mean "that they may teach," and thus to exclude people who could not speak from the obligation to appear at the assembly. Rabbi Tanhum deduced from the words "in their ears" (using the plural for "ears") at the end of that one who was deaf in one ear was exempt from appearing at the assembly.