Musar for Niddah 45:61
גופא אמר רב יהודה אמר רב
ever matter? — In respect of causing its sister to be forbidden.<span class="x" onmousemove="('comment',' To marry the man who betrothed it. It is forbidden to marry a wife's sister. ');"><sup>49</sup></span>
Orchot Tzadikim
And a man should not rejoice to the point of hilarity for now all joy should be mixed with sobriety, for when our "Holy Rabbi" (Rabbi Judah the Prince) used to laugh thus, troubles came to the world (Berakoth 31a). And similarly "Rabbi Jeremiah would bring Rabbi Zera to the point of laughter, but Rabbi Zera did not laugh" (Niddah 23a).
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