Not graded
Al-Adab al-Mufrad 1034
قَالَ أَبُو عَبْدِ اللهِ: وَقَالَتْ قَيْلَةُ: قَالَ رَجُلٌ: السَّلاَمُ عَلَيْكَ يَا رَسُولَ اللهِ، قَالَ: وَعَلَيْكَ السَّلاَمُ وَرَحْمَةُ اللهِ.
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."
Cited in Al-Adab al-Mufrad (No. 1034).