Abu Hurairah reported,

The Messenger of Allah ﷺ said, "Allah عز وجل created Adam in his form, sixty cubits tall. When He had created him, He said, 'Go and greet those people,' referring to a group of angels who were sitting. 'Listen to how they greet you in return, for that will be your greeting and the greeting of your descendants.'Adam went and said, 'Peace be upon you.'They replied, 'Peace be upon you, and the mercy of Allah.' They added the words 'and the mercy of Allah.'So everyone who enters Paradise will be in the form of Adam, sixty cubits tall. Creation has continued to diminish in stature after him until now."

Azami 16420

Sahih

عن أبي هريرة قال

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

الأعظمي 16420صحيح
Contents
Reference
Commentary
Ayat
Collection
Jami al-Kamil
Book
Description of Paradise and Hell and their inhabitants
Chapter
Characteristics of the people of Paradise
Section
Entry of the people of Paradise into Paradise in the form of Adam, and his height being sixty cubits
Numbering
Jami al-Kamil 16420 (2nd edition)
Azami 16420