Al-Matalib al-'Aliyah 4531 — The trial of the grave and the punishment

It is narrated from Imam Ata bin Yasar (may Allah have mercy on him) that the Messenger of Allah (peace and blessings be upon him) asked Sayyiduna Umar bin al-Khattab (may Allah be pleased with him): "O Umar! What will be your state when you die, and people measure out for you (in the form of a grave) three cubits and a span in length and a cubit and a span in width, then they return to you, wash you, shroud you and apply perfume to you, then carry you until they lower you into it (the grave), then pour soil over you; and when they leave you, the two angels who test in the grave, Munkar and Nakir, will come to you, whose voices will be like crashing thunder and whose gazes will be like dazzling lightning. They will shake you, thunder at you and terrify you. So, O Umar, what will be your condition at that hard time?" He said: "O Messenger of Allah (peace and blessings be upon him)! Will my mind (and senses) be with me at that time?" He (peace and blessings be upon him) said: "Yes." At this Sayyiduna Umar (may Allah be pleased with him) said: "Then I (by the grace of Allah) will be enough for the two of them on my own."
Its narrators are thiqat (trustworthy), but this report is mursal.