THE GREETING OF PROPHET ADAM H 857 "When Allah created (Prophet) Adam He said to him, 'Go and give the salutation of peace to that company of angels sitting there and then listen to the greeting they return to you. The reply which they give will be your reply and that of your descendants.' Adam said to the angels, 'Peace be upon you' and they responded: 'Peace be on you and the Mercy of Allah.' angels added to his greeting 'the Mercy of Allah'". R 857 Bukhari and Muslim with a chain up to Abu Hurairah who related that the Prophet, praise and peace be upon him, said this.
845- وعن أَبي هريرة رضي الله عنه ، عن النبيِّ صلى الله عليه وآله وسلم ، قَالَ : "لَمَّا خَلَقَ اللهُ آدَمَ صلى الله عليه وآله وسلم ، قَالَ : اذْهَبْ فَسَلِّمْ عَلَى أُولئِكَ - نَفَرٍ مِنَ المَلاَئِكَةِ جُلُوس - فَاسْتَمِعْ مَا يُحَيُّونَكَ ؛ فَإنَّهَا تَحِيَّتُكَ وَتَحِيَّةُ ذُرِّيتِكَ . فَقَالَ : السَّلاَمُ عَلَيْكُمْ ، فقالوا : السَّلاَمُ عَلَيْكَ وَرَحْمَةُ اللهِ ، فَزَادُوهُ : وَرَحْمَةُ اللهِ" متفقٌ عَلَيْهِ .