Al-Adab Al-Mufrad, Book 42, Hadith 1034 (English) ⓘ
Qayla reported that a mans aid, "Peace be upon you, may Allah bless him and grant him peace." He said, "And peace be upon you and the mercy of Allah."
قَالَ أَبُو عَبْدِ اللهِ: وَقَالَتْ قَيْلَةُ: قَالَ رَجُلٌ: السَّلاَمُ عَلَيْكَ يَا رَسُولَ اللهِ، قَالَ: وَعَلَيْكَ السَّلاَمُ وَرَحْمَةُ اللهِ.
also referenced under: Hadith 1034 (Reference) & Book 42, Hadith 71 (In-Book)