Sayyiduna Abu Waqid al-Laythi (may Allah be pleased with him) says: I heard the Messenger of Allah (peace and blessings be upon him) during the Farewell Pilgrimage saying to his pure wives (may Allah be pleased with them): "This (one), then (it is) the backs of the mats."
The Shaykh says: The Hajj of Sayyidah Aishah (may Allah be pleased with her) and the other Mothers of the Believers (may Allah be pleased with them) after the Messenger of Allah (peace and blessings be upon him) indicates that what is meant by this report is that Hajj is obligatory upon them once, just as its obligation upon men once has been explained; it is not a prohibition of doing more than that. (And Allah knows best.)
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الحج / 8622
Hadith Gradingمحدثین:صحيح لغيره
Hadith Takhrij«صحيح لغيره۔ سنن ابي داود 1722۔ مسند احمد 2/ 446۔ ابويعلي: 7154»