Tosefta sobre Levítico 19:20
וְ֠אִישׁ כִּֽי־יִשְׁכַּ֨ב אֶת־אִשָּׁ֜ה שִׁכְבַת־זֶ֗רַע וְהִ֤וא שִׁפְחָה֙ נֶחֱרֶ֣פֶת לְאִ֔ישׁ וְהָפְדֵּה֙ לֹ֣א נִפְדָּ֔תָה א֥וֹ חֻפְשָׁ֖ה לֹ֣א נִתַּן־לָ֑הּ בִּקֹּ֧רֶת תִּהְיֶ֛ה לֹ֥א יוּמְת֖וּ כִּי־לֹ֥א חֻפָּֽשָׁה׃
Y cuando un hombre tuviere cópula con mujer, y ella fuere sierva desposada con alguno, y no estuviere rescatada, ni le hubiere sido dada libertad, ambos serán azotados: no morirán, por cuanto ella no es libre.
Tosefta Zavim
And what is the difference between a zov and an emission of seed (Lev. 19:20, "שכבת זרע")? Zov comes from "dead flesh" (i.e., a flaccid penis, see Niddah 35b:5, Steinsaltz tr.), and an emission of seed comes from "live flesh" (i.e., an erect penis). Zov is runny, and similar to the white of an unfertilized egg. And an emission of seed is viscous, and is similar in appearance to the white of an egg that is not unfertilized. An emission of seed is reddish and the woman may attribute [a bloodstain on her clothes] to it (see Niddah 8:2).
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