Rif Brachot 22a

22a

{Brachot 31a continues}
Rava said: such as Rabbi Oshaya said: A man may resort to trickery regaring his produce and bring it into his house while it still is in its chaff, so that his animal may eat of it and he will still still be exempt from maaser. Or else that of Rav Huna, for Rav Huna cited Zeiri: If one lets the blood of a consecrated animal, it {the blood} is forbidden to benefit from and such benefit is meila {improper benefit from hekdesh} (*Rabinically) {quite possibly a typo, copied from the next word - Bach notes old seforim don't have it.}.

The Sages did like the Mishna {that one prays from a serious frame of mind}.
Rav Shimi bar Ashi did like the brayta.

For they learnt {in a brayta}: One should not stand up to say Tefillah while immersed in sorrow, or idleness, or laughter, or chatter, or frivolity, or idle talk, but only while still rejoicing in the performance of some religious act. Similarly a man before taking leave of his fellow should not finish off with ordinary conversation, or joking, or frivolity, or idle talk, but with some matter of halachah. For so we find with the early prophets that they concluded their harangues with words of praise and comfort.

And so did Mari the son of Rav Huna the son of Rav Yirmiya bar Abba learnt {tanei}: A man before taking leave of his fellow should not finish off with ordinary conversation, or joking, or frivolity, or idle talk, but with some matter of halachah, so that he should remember him thereby.
{The girsa is our gemara had Mari saying simply: A man before taking leave of his fellow should finish with some matter of halachah, so that he should remember him thereby.}