Halakhah к Вайикра 15:26
כָּל־הַמִּשְׁכָּ֞ב אֲשֶׁר־תִּשְׁכַּ֤ב עָלָיו֙ כָּל־יְמֵ֣י זוֹבָ֔הּ כְּמִשְׁכַּ֥ב נִדָּתָ֖הּ יִֽהְיֶה־לָּ֑הּ וְכָֽל־הַכְּלִי֙ אֲשֶׁ֣ר תֵּשֵׁ֣ב עָלָ֔יו טָמֵ֣א יִהְיֶ֔ה כְּטֻמְאַ֖ת נִדָּתָֽהּ׃
Каждая постель, на которой она будет лежать все дни своей жизни, должна быть для нее постелью ее нечистоты; и все, на чем она сидит, будет нечисто, как нечистота нечистоты ее.
Shulchan Arukh, Yoreh De'ah
One who releases his slave transgresses a positive commandment (Lev 15:26) “forever you will make them work for you." it is permitted to free a slave for the sake of a Mitzvah, even a rabbinic one, for example if one was short a man in the synagogue for a making a minyan, if one only had 9 one should free his slave to make 10, and so forth. As well as a maid servant if it is customary for her to behave inappropriately with others we compel her master to free her, in order that the barrier be removed.
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