It is narrated from Sayyiduna Hudhayfah bin Yaman (may Allah be pleased with him), he says: We were sitting with Sayyiduna Umar (may Allah be pleased with him), he asked: Does anyone among you remember any hadith of the Messenger of Allah (peace and blessings be upon him) regarding tribulations? I said: Yes, I remember a hadith about tribulation. He said: You are bold in narrating the hadiths of the Messenger of Allah (peace and blessings be upon him) about tribulation. I said: The tribulations in which a person is involved regarding his family, wealth, children, and neighbors, acts of goodness such as prayer, charity, enjoining good, and forbidding evil become expiation for such tribulations. Sayyiduna Umar (may Allah be pleased with him) said: I am not asking about such tribulation, my question is about that tribulation which will come like the waves of the sea. I said: O Commander of the Faithful! You do not need to fear that, between you and it there is a closed door. He asked: Will that door be broken or opened? I said: Rather, it will be broken. He said: Then it will never be closed again. We asked Sayyiduna Hudhayfah whether Sayyiduna Umar (may Allah be pleased with him) knew who was meant by the door? He said: Yes, he knew the door just as he knew that night comes before tomorrow. Waki’ narrated in his hadith: Masruq said to Sayyiduna Hudhayfah (may Allah be pleased with him): O Abu Abdullah! Did the Messenger of Allah (peace and blessings be upon him) explain to Sayyiduna Umar (may Allah be pleased with him) the reality and meaning of what he told him? While we asked: Did Sayyiduna Umar (may Allah be pleased with him) know who the door was? Sayyiduna Hudhayfah (may Allah be pleased with him) replied that he knew it just as he knew that night comes before tomorrow. Remember, I have stated these facts, these are not mere stories. At first, we did not dare to ask Sayyiduna Hudhayfah (may Allah be pleased with him) who was meant by the door. Then we said to Masruq that he should ask him about it, so when he asked Sayyiduna Hudhayfah (may Allah be pleased with him), he informed that by the door was meant Sayyiduna Umar (may Allah be pleased with him).