Sunan Ibn Majah Book 19, Hadith 13

“Whoever becomes the master of a Mahram relative (with whom marriage is not lawful), he becomes free.”

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“I said: 'O Messenger of Allah (ﷺ), which slave is best?' He said: ‘The one who is most precious to his master and most valuable in price.' ”

Sunan Ibn Majah Book 19, Hadith 12
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“Whoever becomes the master of a Mahram relative, he becomes free.”

Sunan Ibn Majah Book 19, Hadith 14