Zadhan narrated: Sayyidah Umm Salamah (may Allah be pleased with her) saw a cousin of hers prostrating, and she said: May your face be covered in dust, for the Prophet (peace and blessings be upon him) said to a freed slave of ours called Rabah, whom he had seen prostrating: "May your face be covered in dust, O Rabah!"
Hadith Referenceالمعجم الكبير للطبراني / مسند النساء / 20244