The Book Pertaining to the Merits of the Companions (Allah Be Pleased With Them) of the Holy Prophet (May Peace Be Upon Him) (Kitab Al-Fada'il Al-Sahabah)
Muslim :: Book 31 : Hadith 5986
A'isha reported that Allah's Messenger (may peace be upon him) at the time of breathing his last was reclining against her chest and she was leaning over him and listening to him as he was saying: O Allah, grant me pardon, show mercy to me, enjoin me to companions (on High).