It is narrated from Sayyidah Umm Salamah (may Allah be pleased with her) that the Prophet (peace and blessings be upon him) said: "When one of you (women) has a mukatab slave, and he has with him (the remainder) that he is to pay, let her observe hijab from him."
Hadith Referenceالمعجم الكبير للطبراني / مسند النساء / 20257
Sayyidah Umm Salamah (may Allah be pleased with her) said: I was with the Prophet (peace and blessings be upon him), and Maymunah (may Allah be pleased with her) was also with him (peace and blessings be upon him), when Ibn Umm Maktum (may Allah be pleased with him) came. Then the narrator narrated the rest of the hadith in full.
Hadith Referenceالمعجم الكبير للطبراني / مسند النساء / 20258