(7) بَابُ إِذَا قَالَ أَحَدُكُمْ آمِينَ. وَالْمَلاَئِكَةُ فِي السَّمَاءِ، فَوَافَقَتْ إِحْدَاهُمَا الأُخْرَى، غُفِرَ لَهُ مَا تَقَدَّمَ مِنْ ذَنْبِهِ
Narrated Ibn `Abbas:
The Prophet (ﷺ) said, "On the night of my Ascent to the Heaven, I saw Moses who was a tall brown curlyhaired man as if he was one of the men of Shan'awa tribe, and I saw Jesus, a man of medium height and moderate complexion inclined to the red and white colors and of lank hair. I also saw Malik, the gate-keeper of the (Hell) Fire and Ad-Dajjal amongst the signs which Allah showed me." (The Prophet then recited the Holy Verse): "So be not you in doubt of meeting him' when you met Moses during the night of Mi'raj over the heavens" (32.23) Narrated Anas and Abu Bakra: "The Prophet (ﷺ) said, "The angels will guard Medina from Ad-Dajjal (who will not be able to enter the city of Medina).
Reference: Sahih al-Bukhari 3239
In-book reference: Book 59, Hadith 50
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 4, Book 54, Hadith 462