Sayyidah Aishah (may Allah be pleased with her) said: I have not seen any woman in whose skin I would rather be (that is, whom I would rather be like) than Sayyidah Sawdah (may Allah be pleased with her), a woman in whom there was some sharpness. When she grew old, she said: "O Messenger of Allah! I give my turn to Aishah." So the Prophet of Allah (peace and blessings be upon him) used to allot two days to Sayyidah Aishah (may Allah be pleased with her): her own day and the day of Sayyidah Sawdah (may Allah be pleased with her).
Hadith Referenceالسنن الكبرى للبيهقي / كتاب النكاح / 13433