English: Rava said: One who engages in idle conversation violates a positive commandment, as it is said “and you shall speak of them” — of them, and not of other matters.
On the daf / in context: The restrictive reading of “bam” turns the obligation to speak of Torah into a prohibition of purely secular chatter (in the relevant contexts of the verse).
Type of Learning
Diyuk of “vedibarta bam” — “of them” and not of other things.
What Is Learned
Idle talk violates the positive commandment “and you shall speak of them”; speech should be devoted to the words of Torah.