Reference for Bava Kamma 163:15

דתניא (ויקרא יד, ט) ורחץ את בשרו במים שלא יהא דבר חוצץ בין בשרו למים את בשרו את הטפל לבשרו ומאי ניהו שער

as it is written: <i>'That bringeth forth its fruit in its season'</i><span class="x" onmousemove="('comment',' Ps. I, 3. ');">²⁴</span> and Rab Judah, or as others say R. Nahman, or as still others say R. Kahana, or again as others say R. Johanan, stated that this refers to him who performs his marital duty every Friday night.<span class="x" onmousemove="('comment',' Cf. Keth. 62b. ');">²⁵</span>

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