The classical source expands or derives a specific point from the language of the passuk. The Core Text above is the relevant region of interest.
Type of Learning
Custom (A restriction learned from the requirement of joy — the declaration is said only during the season of gathering and rejoicing.)
What Is Learned
Chazal teach that the mikra bikkurim is tied to the joyful harvest period. After Sukkos the fruit may still be brought until Chanukah, but the declaration is omitted because the season of simchah has passed.