Narrated Nu`am Al-Mujmir: Once I went up the roof of the mosque, along with Abu Huraira. He perform ablution and said, I heard the Prophet saying, On the Day of Resurrection, my followers will be called Al-Ghurr-ul- Muhajjalun from the trace of ablution and whoever can increase the area of his radiance should do so (i.e. by performing ablution regularly).'