(451) بَابُ السَّلامُ اسْمٌ مِنْ أَسْمَاءِ اللهِ عَزَّ وَجَلَّ
Ibn Mas'ud said, " They were doing the prayer with the Prophet,may Allah bless him and grant him peace, and someone said, 'Peace be uponAllah.' When the Prophet, may Allah bless him and grant him peace, finishedthe prayer, he said, 'Who said "Peace be upon Allah"? Allah is Peace. Rathersay, "Greetings belong to Allah and good words and prayers. Peace be uponyou, O Prophet and the mercy of Allah and His blessings. Peace be uponus and upon all the right-acting slaves of Allah. I testify that thereis no god but Allah and I testify that Muhammad is His slave and Messenger."'"
Reference: Al-Adab Al-Mufrad 990
In-book reference: Book 42, Hadith 26
English translation: Book 42, Hadith 990