It is narrated from Sayyiduna Abu Dharr and Sayyiduna Abu Darda (may Allah be pleased with them both), the Messenger of Allah (peace and blessings be upon him and his family) said: On the Day of Resurrection, I will recognize the people of my Ummah among all the nations. The Companions asked: O Messenger of Allah (peace and blessings be upon him and his family), how will you recognize your Ummah? He (peace and blessings be upon him and his family) said: I will recognize them, their books of deeds will be given in their right hands and there will be a mark on their faces due to prostrations, I will recognize them by this mark as well, and there will be light running ahead of them, by this too I will recognize them.