Explanation

Hazart Usman (R.A) is generally credited with the compilation and standardization of the Quran into a single written book form. Hazart Abu Bakar (R.A) compiled the Quran after the Battle of Yamama but did not write it in final book form. Hazart Zaid bin sabit (R.A) was instrumental in writing down verses but not the final arrangement. Hazart Hafsa (R.A) was a companion who preserved knowledge but is not credited with this specific compilation.