حَدَّثَنَا أَبُو بَكْرِ بْنُ أَبِي شَيْبَةَ، حَدَّثَنَا إِسْمَاعِيلُ ابْنُ عُلَيَّةَ، عَنِ ابْنِ عَوْنٍ، عَنْ إِبْرَاهِيمَ، عَنِ الأَسْوَدِ، قَالَ ذَكَرُوا عِنْدَ عَائِشَةَ أَنَّ عَلِيًّا كَانَ وَصِيًّا ‏.‏ فَقَالَتْ مَتَى أَوْصَى إِلَيْهِ فَلَقَدْ كُنْتُ مُسْنِدَتَهُ إِلَى صَدْرِي - أَوْ إِلَى حِجْرِي فَدَعَا بِطَسْتٍ فَلَقَدِ انْخَنَثَ فِي حِجْرِي فَمَاتَ وَمَا شَعَرْتُ بِهِ فَمَتَى أَوْصَى ـ صلى الله عليه وسلم ـ ‏.‏

It wasnarrated that Aswad said: “They said in ‘Aishah’s presencethat‘Ali was appointed (by the Prophet (PBUH) before he died), and shesaid: ‘When was he appointed? He (the Prophet (PBUH)) was restingagainst my bosom, or in my lap, and he called for a basin, then hebecame limp in my lap and died, and I did not realize it. So when didhe (PBUH) appoint him?’” Translation Not Available

Book Ref: Sunan Ibn Majah Book 6 Hadith 1626
Web Ref:  Sunan Ibn Majah Vol 1 Book 6 Hadith 1626

---