Allah (may He be exalted) has ordained for the believers characteristics and features by which they will be distinguished from others in the hereafter, and by which the Prophet (blessings and peace of Allah be upon him) will recognize his followers on the Day of Resurrection, as signs of faith and Islam, such as the traces of wudu’, which will appear in the form of light that will be visible on the parts of the body that are washed in wudu’. In this hadith, Nu‘aym al-Mujmir narrates that he climbed up to the roof of the Prophet’s Mosque with Abu Hurayrah, who did wudu’ in a complete and thorough manner, giving each part its due share of water and washing. Then he told him that the Prophet (blessings and peace of Allah be upon him) had given the glad tidings to his ummah who responded to his call, that Allah (may He be exalted) would give them a distinct sign on the Day of Resurrection and would call them before all people with shining faces and limbs, because of the traces of wudu’. The word translated here as shining faces refers to white markings on the forehead [of a horse]; what is meant here is the light that will appear on the faces of the ummah of Muhammad (blessings and peace of Allah be upon him). The word translated here as shining limbs refers to white markings on the legs [of a horse]; what is meant here is also light, for wudu’ leaves traces on the face, legs and arms that will be white and light on the Day of Resurrection. This is something that will be unique to this ummah among all other nations. Because wudu’ leaves these traces, Abu Hurayrah (may Allah be pleased with him) advised people to expand this brightness, as he said: So whoever among you is able to expand the area of his face that will shine, let him do so. So he should expand the brightness of his face and limbs. He mentioned the brightness on the face only, because it also implies brightness on the limbs. And it was said that he mentioned the brightness on the face only, to the exclusion of the limbs, because the face is the noblest part that is washed in wudu’ and it is what is first seen and noticed in a person. However the report narrated by Muslim mentions both, as it says: “Let him expand the area of his face and limbs that will shine.”.