What is behind the gate of death?

The yellow books that write about the torment of the grave and narrate the details, scenes, and stories about what happens inside the grave, about the two angels Nakir and Munkar, and what they say to the deceased, and what the deceased says in defense of himself, and the colors of torment he faces... are many books that fill the sidewalks and people rush to them, and most of these books are imaginations... and the matter is unseen, no one has knowledge of it, and the only reference is the words of the Quran and the testimony of the unseen and seen world about these secrets. Authored by: Dr. Mustafa Mahmoud A poetry collection for publication