Narrated `Abdullah:
(regarding the revelation) Truly he (Muhammad) did see of the signs of his Lord; the Greatest!' (53.18) The Prophet (ﷺ) saw a green screen covering the horizon. (PT)
USC-MSA web (English) reference: Vol. 6, Book 60, Hadith 381 (PT)
Arabic reference (PT): Book 65, Hadith 4858 (PT)