Musar for Niddah 45:33
רבי ינאי אמר
refers to the black of the eye<span class="x" onmousemove="('comment',' The pupil, which has the same round shape in man and beasts. ');"><sup>28</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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