English: “Lower, second, and third” — It was taught: the lower deck for refuse, the middle for the animals, the upper for the people.
On the daf / in context: The three levels are assigned functional roles. (Midrashic sources preserve variant assignments, some placing refuse on the uppermost level to avoid rising odors; the Bavli version places refuse at the bottom so it can be discharged outward.)
Type of Learning
Custom (assignment of function to the three decks named in the verse).
What Is Learned
The ark’s three decks served distinct purposes: lower for refuse, middle for animals, upper for the human family.