(447) بَابُ بَدْءِ السَّلامِ
Abu Hurayra reported that the Prophet, may Allah bless him andgrant him peace, said, "Allah created Adam, may Allah bless him and granthim peace, and his height was 60 spans. He said, 'Go and greet those (agroup of angels who were sitting down) and listen to how they answer you.It is your greeting and the greeting of your descendants.' He said, 'Peacebe upon you,' and they replied, 'Peace be upon you and the mercy of Allah.'They added, 'and the mercy of Allah'. All who enter the Garden will havehis form, but creation has continued to decline until now.'"
Reference: Al-Adab Al-Mufrad 978
In-book reference: Book 42, Hadith 14
English translation: Book 42, Hadith 978