Narrated Nu’am Al-Mujmir (Radhiallahu anhu):
Once I went up the roof of the mosque, along with Abu Huraira (Radhiallahu anhu). He perform ablution and said, “I heard the Prophet (Sallallaahu ‘alaihi wasallam) 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).’ “
[Sahih Bukhari – Book #4 – Hadith #138]
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