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Bukhari :: Book 7 :: Volume 70 :: Hadith 553

Narrated Al-Bara bin Azib:

Allah's Apostle ordered us to do seven things and forbade us to do seven other things. He forbade us to wear gold rings, silk, Dibaj, Istabriq, Qissy, and Maithara; and ordered us to accompany funeral processions, visit the sick and greet everybody. (See Hadith No. 104)