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Al-Adab al-Mufrad 989
حَدَّثَنَا شِهَابٌ، قَالَ: حَدَّثَنَا حَمَّادُ بْنُ سَلَمَةَ، عَنْ حُمَيْدٍ، عَنْ أَنَسٍ قَالَ: قَالَ رَسُولُ اللهِ صلى الله عليه وسلم: إِنَّ السَّلامَ اسْمٌ مِنْ أَسْمَاءِ اللهِ تَعَالَى، وَضَعَهُ اللَّهُ فِي الأَرْضِ، فَأَفْشُوا السَّلامَ بَيْنَكُمْ.
Anas reported that the Messenger of Allah, may Allah bless him and grant him peace, said, "As-Salam (peace) is one of the Names of Allah Almighty which Allah has placed in the earth. Therefore give the greeting among yourselves."
Cited in Al-Adab al-Mufrad (No. 989).