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Sayyiduna Abu Hurayrah رضي الله عنه narrated that Allah's Messenger صلى الله عليه وسلم said, "Allah created Aadam عليه السلام in His form and a height of sixty cubits. So, when He created him, He said, 'Go and offer salaam to that company and pay heed to the response they offer, for, that is going to be the salaam for you and for your offspring! As also the response to the salaam.' So, he went (to them) and said, 'as-Salaam u Alaykum' (peace be on you all). They responded 'as-salaam u alayka wa rahmatullahi,' having added in the response wa rahmatullahi (and Allah's mercy)." He (the Prophet) صلى الله عليه وسلم said, "Thus, all who enter paradise will have the form of Aadam عليه السلام with a height of sixty cubits. But, the creatures have continued to diminish (in height) after him till now (at the current height)." [1]