Musnad Abu Ya'la al-Mawsili 150:327

Yahya ibn Ayyub narrated to us, Ismail ibn Ja'far narrated to us, and Sharik informed me, from Ata ibn Yasar, from Aisha, that she said: Whenever it was the night of the Messenger of Allah (peace be upon him) with her, he would go out at the end of the night to al-Baqi'. He would say: "Peace be upon you, O abode of a believing people. What you were promised has come to you, deferred until tomorrow, and we, if Allah wills, will join you. O Allah, forgive the people of Baqi' al-Gharqad."