Sayyidah Aishah (may Allah be pleased with her) said: The Messenger of Allah (peace and blessings be upon him) used to be just in dividing turns and would say: 'Allahumma hadha qasmi fima amlik, fa la talumni fima tamliku wa la amlik' (O Allah, this is my division in what I own, so do not blame me for what You own and I do not own). Al-Qadi (may Allah have mercy on him) said: The heart is meant, and this concerns justice between the wives. Imam al-Shafi'i (may Allah have mercy on him) said: It reached us that during his illness he (peace and blessings be upon him) used to be carried around to his wives, until they released him (peace and blessings be upon him) (from it).
Hadith Referenceالسنن الكبرى للبيهقي / كتاب القسم والنشوز / 14745