Sayyidah Aishah (may Allah be pleased with her) said that on the day his (peace and blessings be upon him) illness began, he (peace and blessings be upon him) came to my house. I said: "Oh, my head!" He (peace and blessings be upon him) said: "I would wish that, if you were to die in my lifetime, I would pray over you and bury you." She said: I said: You (peace and blessings be upon him) would then be enjoying yourself that day with some of your wives. He (peace and blessings be upon him) said: 'Wa ra'sah' "Oh, my head! Call your father and your brother to me so that I may write something for Abu Bakr (may Allah be pleased with him), for I fear that afterwards someone may wish (for it) and someone may say something other than Abu Bakr (may Allah be pleased with him), whereas the believers and Allah would refuse (anyone else)."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب قتال أهل البغي / 16588