Musnad Ahmad 254:2

Ya'qub narrated to us, he said: My father narrated to us, he said: From Muhammad ibn Ishaq, he said: 'Abdullah ibn 'Umar al-'Abli narrated to me, he said: 'Ubayd ibn Jubayr, the freed slave of al-Hakam ibn Abi al-'As, narrated to me, from 'Abdullah ibn 'Amr, from Abu Muwayhibah, the freed slave of the Messenger of Allah (peace and blessings of Allah be upon him), who said: The Messenger of Allah (peace and blessings of Allah be upon him) sent for me in the middle of the night and said: "O Abu Muwayhibah, I have been commanded to seek forgiveness for the people of al-Baqi', so come with me." So I went with him. When he stood among them, he said: "Peace be upon you, O people of the graves. May that which you have awakened in be pleasant for you, in contrast to that which the people have awakened in. If you knew what Allah has saved you from! The tribulations have approached like pieces of a dark night, the first of which follows the last; the latter is worse than the former." He said: Then he turned to me and said: "O Abu Muwayhibah, I have been given the keys to the treasures of the world, and eternity therein, and then Paradise. I was given the choice between that and meeting my Lord, the Mighty and Majestic, and Paradise." I said: May my father and mother be sacrificed for you, take the keys to the world, and eternity therein, and then Paradise. He said: "No, by Allah, O Abu Muwayhibah, I have chosen the meeting of my Lord and Paradise." Then he sought forgiveness for the people of al-Baqi', then he departed. And the Messenger of Allah (peace and blessings of Allah be upon him) began to suffer from the illness in which Allah, the Mighty and Majestic, took his soul when morning came.