Sahih al-Bukhari, Volume 7, Book 70, Hadith 556 (USC-MSA) ⓘ
Narrated 'Ata: That he had seen Um Zafar, the tall black lady, at (holding) the curtain of the Ka`ba.
حَدَّثَنَا مُحَمَّدٌ، أَخْبَرَنَا مَخْلَدٌ، عَنِ ابْنِ جُرَيْجٍ، أَخْبَرَنِي عَطَاءٌ، أَنَّهُ رَأَى أُمَّ زُفَرَ تِلْكَ، امْرَأَةٌ طَوِيلَةٌ سَوْدَاءُ عَلَى سِتْرِ الْكَعْبَةِ.
also referenced under: Book 75, Hadith 13 (In-Book) & Hadith 5652 (DarusSalam)