It is narrated from Sayyiduna Bara’ bin Azib (may Allah be pleased with him), he says: We were with the Messenger of Allah (peace and blessings be upon him), when suddenly he saw some people gathered at a place and asked: Why are these people gathered and for what? Someone said: They are gathered at a grave, they are digging it. Upon hearing this, the Messenger of Allah (peace and blessings be upon him) became distressed and hurried ahead of his companions, quickly reaching the grave and sat down on his knees beside it. I came in front of him to see what he (peace and blessings be upon him) was doing. He (peace and blessings be upon him) wept so much that the ground became wet with his tears. Then he (peace and blessings be upon him) turned towards us and said: My brothers! Prepare for this day.