Sahih Bukhari Volume 1, Book 10, Hadith 665

حَدَّثَنَا إِبْرَاهِيمُ بْنُ مُوسَى، قَالَ أَخْبَرَنَا هِشَامُ بْنُ يُوسُفَ، عَنْ مَعْمَرٍ، عَنِ الزُّهْرِيِّ، قَالَ أَخْبَرَنِي عُبَيْدُ اللَّهِ بْنُ عَبْدِ اللَّهِ، قَالَ قَالَتْ عَائِشَةُ لَمَّا ثَقُلَ النَّبِيُّ صلى الله عليه وسلم وَاشْتَدَّ وَجَعُهُ اسْتَأْذَنَ أَزْوَاجَهُ أَنْ يُمَرَّضَ فِي بَيْتِي فَأَذِنَّ لَهُ، فَخَرَجَ بَيْنَ رَجُلَيْنِ تَخُطُّ رِجْلاَهُ الأَرْضَ، وَكَانَ بَيْنَ الْعَبَّاسِ وَرَجُلٍ آخَرَ‏.‏ قَالَ عُبَيْدُ اللَّهِ فَذَكَرْتُ ذَلِكَ لاِبْنِ عَبَّاسٍ مَا قَالَتْ عَائِشَةُ فَقَالَ لِي وَهَلْ تَدْرِي مَنِ الرَّجُلُ الَّذِي لَمْ تُسَمِّ عَائِشَةُ قُلْتُ لاَ‏.‏ قَالَ هُوَ عَلِيُّ بْنُ أَبِي طَالِبٍ‏

Narrated By 'Aisha : "When the Prophet became seriously ill and his disease became aggravated he asked for permission from his wives to be nursed in my house and he was allowed. He came out with the help of two men and his legs were dragging on the ground. He was between Al-Abbas and another man." 'Ubaid Ullah said, "I told Ibn 'Abbas what 'Aisha had narrated and he said, 'Do you know who was the (second) man whose name 'Aisha did not mention'" I said, 'No.' Ibn 'Abbas said, 'He was 'Ali Ibn Abi Talib.'"