Ki Tetze: Chapter 11
"And you put your nest in a rock"

Rav Hamnuna Saba, who is here referred to as a great fish, speaks to the Faithful Shepherd about the title verse, and he says that the Mishnah sages must be strong and have a sharp tongue to bore through to reach the great abyss. He tells Moses that he will descend to the great abyss to find the time of the redemption because of his righteousness. Other sages tried to go there into the depth of the Halachah but did not come back up again, as they were not strong enough. Rav Hamnuna Saba says that whoever pierces the rock without permission will be bitten by a serpent.