Sahih al-Bukhari 6227
Narrated Abu Huraira:
The Prophet (ﷺ) said, "Allah created Adam in His picture, sixty cubits (about 30 meters) in height. When 
He created him, He said (to him), "Go and greet that group of angels sitting there, and listen what they 
will say in reply to you, for that will be your greeting and the greeting of your offspring." Adam (went 
and) said, 'As-Salamu alaikum (Peace be upon you).' They replied, 'AsSalamu-'Alaika wa 
Rahmatullah (Peace and Allah's Mercy be on you) So they increased 'Wa Rahmatullah' The Prophet (ﷺ) 
added 'So whoever will enter Paradise, will be of the shape and picture of Adam Since then the 
creation of Adam's (offspring) (i.e. stature of human beings is being diminished continuously) to the 
present time."
حَدَّثَنَا يَحْيَى بْنُ جَعْفَرٍ، حَدَّثَنَا عَبْدُ الرَّزَّاقِ، عَنْ مَعْمَرٍ، عَنْ هَمَّامٍ، عَنْ أَبِي هُرَيْرَةَ، عَنِ النَّبِيِّ صلى الله عليه وسلم قَالَ ‏
"‏ خَلَقَ اللَّهُ آدَمَ عَلَى صُورَتِهِ، طُولُهُ سِتُّونَ ذِرَاعًا، فَلَمَّا خَلَقَهُ قَالَ اذْهَبْ فَسَلِّمْ عَلَى أُولَئِكَ النَّفَرِ مِنَ الْمَلاَئِكَةِ جُلُوسٌ، فَاسْتَمِعْ مَا يُحَيُّونَكَ، فَإِنَّهَا تَحِيَّتُكَ وَتَحِيَّةُ ذُرِّيَّتِكَ‏.‏ فَقَالَ السَّلاَمُ عَلَيْكُمْ‏.‏ فَقَالُوا السَّلاَمُ عَلَيْكَ وَرَحْمَةُ اللَّهِ‏.‏ فَزَادُوهُ وَرَحْمَةُ اللَّهِ، فَكُلُّ مَنْ يَدْخُلُ الْجَنَّةَ عَلَى صُورَةِ آدَمَ، فَلَمْ يَزَلِ الْخَلْقُ يَنْقُصُ بَعْدُ حَتَّى الآنَ ‏"‏‏.‏