“Whoever claimed that (the Prophet) Muhammad saw his Lord, is committing a great fault, for he only saw Gabriel in his genuine shape in which he was created covering the whole horizon.”
Sahih al-Bukhari 3234
In-book reference : Book 59, Hadith 45
USC-MSA web (English) reference : Vol. 4, Book 54, Hadith
I asked Aisha "What about His Statement:-- "Then he (Gabriel) approached And came closer, And was at a distance Of but two bow-lengths Or (even) nearer?" (53.8-9) She replied, "It was Gabriel who used to come to the Prophet (ﷺ) in the figure of a man, but on that occasion, he came in his actual and real figure and (he was so huge) that he covered the whole horizon."
Reference : Sahih al-Bukhari 3235
In-book reference : Book 59, Hadith 46
USC-MSA web (English) reference : Vol. 4, Book
I looked further into the Hadith you were referencing and the 2 after that were these here. I’m assuming from reading the hadiths that it was Angel Jibra’eel. Please correct me if this wrong
EDIT-The above hadith has been mentioned by Imam Bukhari twice in his Sahih both places are mentioned in the Arabic texts.
"The Prophet S.A.W seen a green carpet spread all over the sky means that Gabriel A.S. spread of a single wing was like a green carpet. Gabriel A.S. has six hundred wings and if spreads a single wing it covers, the entire sky. This meaning is further substantiated by a Hadith mentioned by Imams Ahmad and Tirmidi.
عن عبد الرحمن بن يزيد عن ابن مسعود رضي الله عنه "رأى جبريل في حلة من رفرف قد ملاء ما بين السماء والأرض" وبهذه الرواية يعرف المراد بالرفرف وانه حلة
Gabriel A.S was wearing a cloak. رفرف means a pillow or flutter or flap of wings. The رفرف is made from silk brocade.
When Gabriel A.S spread his wing it seemed like a silk spread.
والله أعلم وعلمه أتم