Sahih Muslim Book - 11, Hadith - 2257

حَدَّثَنَا أَبُو بَكْرِ بْنُ أَبِى شَيْبَةَ وَزُهَيْرُ بْنُ حَرْبٍ قَالاَ حَدَّثَنَا مُحَمَّدُ بْنُ عَبْدِ اللَّهِ الأَسَدِىُّ عَنْ سُفْيَانَ عَنْ عَلْقَمَةَ بْنِ مَرْثَدٍ عَنْ سُلَيْمَانَ بْنِ بُرَيْدَةَ عَنْ أَبِيهِ قَالَ كَانَ رَسُولُ اللَّهِ -صلى الله عليه وسلم- يُعَلِّمُهُمْ إِذَا خَرَجُوا إِلَى الْمَقَابِرِ فَكَانَ قَائِلُهُمْ يَقُولُ - فِى رِوَايَةِ أَبِى بَكْرٍ - السَّلاَمُ عَلَى أَهْلِ الدِّيَارِ - وَفِى رِوَايَةِ زُهَيْرٍ - السَّلاَمُ عَلَيْكُمْ أَهْلَ الدِّيَارِ مِنَ الْمُؤْمِنِينَ وَالْمُسْلِمِينَ وَإِنَّا إِنْ شَاءَ اللَّهُ لَلاَحِقُونَ أَسْأَلُ اللَّهَ لَنَا وَلَكُمُ الْعَافِيَةَ.

It was narrated from Sulaiman bin Buraidah that his father said: "The Messenger of Allah (s.a.w) used to teach them, when they went out to the graves, to say: - according to the report of Abu Bakr: 'As-Salamu 'ala ahlad-diyar (Peace be upon the people of these abodes);' - according to the report of Zuhair: 'As-Salamu 'alaikum ahlad-diyar min al-mu'minina wal-muslimina, wa inna, in sha' Allahu lalahiqun (Peace be upon you, O people of these abodes - believers and Muslims, and we will, if Allah wills, join you soon. I ask Allah for pardon for us and for you.)"'