That knowledge is of no avail which is not put into practice

Usman ibn Affan R.A(577 to June 17, 656 AD)

Uthman ibn Affan, also known in English by the Turkish and Persian rendering Osman, was, a son-in-law and notable companion of the Islamic prophet Muhammad (PBUM), the third of the Rashidun, or "Rightly Guided Caliphs"