Hadith 17:379
Ibn Numayr narrated to us, from Ubayd Allah ibn Umar, who said: Sa'id ibn Abi Sa'id al-Maqburi narrated to me, from Abu Hurayrah, that a man entered the mosque while the Messenger of Allah (may Allah bless him and grant him peace) was sitting in a corner of the mosque. He prayed, then he came and greeted him. He (the Prophet) said: "And upon you be peace."
حدثنا بن نمير عن عبيد الله بن عمر قال حدثني سعيد بن أبي سعيد المقبري عن أبي هريرة أن رجلا دخل المسجد ورسول الله صلى الله عليه وسلم جالس في ناحية المسجد فصلى ثم جاء فسلم عليه فقال وعليك السلام