Sayyidah Aishah (may Allah be pleased with her) said that whenever it was her turn with the Messenger of Allah (peace and blessings be upon him), he (peace and blessings be upon him) would go out to al-Baqi' in the last part of the night and say: "'As-salamu alaykum dara qawmin mu'minin, wa atakum ma tu'aduna ghadan mu'ajjalun, wa inna in sha' Allahu bikum lahiqun. Allahumma-ghfir li-ahli Baqi' al-Gharqad' (Peace be upon you, O dwellers of the abode of the believers! There has come to you what you were promised; you have been given respite until tomorrow; and we, if Allah wills, shall join you. O Allah, forgive the people of Baqi' al-Gharqad.)"
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الجنائز / 7210