Abu Hurairah reported,

The Messenger of Allah ﷺ said, "Allah created Adam in His image, sixty cubits tall. When He had created him, He said to him, 'Go and greet that group,' meaning a group of angels who were sitting there, 'and listen to how they answer you, for that will be your greeting and the greeting of your descendants.'So Adam went and said, 'Peace be upon you.'They replied, 'Peace be upon you, and the mercy of Allah,' adding the words 'the mercy of Allah.'So everyone who enters Paradise will have the form of Adam, sixty cubits tall. But mankind kept diminishing in stature after him, right up to the present day."

وقال رسول الله ﷺ خلق الله عز وجل آدم على صورته طوله ستون ذراعا فلما خلقه قال له اذهب فسلم على أولئك النفر وهم نفر من الملائكة جلوس واستمع ما يجيبونك فإنها تحيتك وتحية ذريتك قال فذهب فقال السلام عليكم فقالوا السلام عليك ورحمة الله فزادوه رحمة الله قال فكل من يدخل الجنة على صورة آدم وطوله ستون ذراعا فلم يزل ينقص الخلق بعد حتى الآن