Mishkat al-Masabih #3266
Emancipation
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
وَعَنْ أُمِّ سَلَمَةَ قَالَتْ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: «إِذَا كَانَ عِنْدَ مكَاتب إحداكن وَفَاء فلنحتجب مِنْهُ» . رَوَاهُ التِّرْمِذِيُّ وَأَبُو دَاوُدَ وَابْنُ مَاجَهْ
Umm Salama reported God's Messenger as spying, “When a slave of one of you women has made an agreement to purchase his freedom and can pay the full price, she must veil herself from him.”
Tirmidhi, Abu Dawud and Ibn Majah transmitted it.
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About Mishkat al-Masabih
This hadith is #3266 from Mishkat al-Masabih, in the Book of Emancipation.