Musnad Ahmad 1153:462

Aswad ibn Amir narrated to us, he said: Sharik narrated to us, from Asim ibn Ubayd Allah, from al-Qasim, from Aisha, she said: The Prophet, peace and blessings of Allah be upon him, stood up at night, and I thought he was going to some of his wives, so I followed him. He came to the graveyards, then said: "Peace be upon you, abode of a believing people, and we will, by Allah, join you. O Allah, do not deprive us of their reward, and do not try us after them." She said: Then he turned and saw me, and said: "Woe to her, if she were able, she would not have done [this]." He said: Sharik mentioned it another time, from Yahya ibn Sa'id, from al-Qasim ibn Muhammad, from Aisha, from the Prophet, peace and blessings of Allah be upon him, the like of it.