Trace of ablution (wudu') on the day of resurrection

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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