صحيح البخاري
Sahih Bukhari
كتاب الوضوء
The Book of Wudu (Ablution)
بَابُ فَضْلِ الْوُضُوءِ، وَالْغُرُّ الْمُحَجَّلُونَ مِنْ آثَارِ الْوُضُوءِ:
(3) Chapter. The superiority of ablution. And Al-Ghurr-ul-Muhajjalun (the parts of the body of the Muslims washed in ablution will shine on the Day of Resurrection and the angels will call them by that name) from the traces of ablution.
1 hadith
Hadith 136
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).' "