It is narrated from Sayyiduna Zayd bin Thabit (may Allah be pleased with him); he said: In the presence of the Messenger of Allah (peace and blessings be upon him), we used to compile the Qur'an from pieces of paper and pieces of leather. This hadith is sahih (authentic) on the condition of the two Shaykhs (Bukhari and Muslim), but they did not record it. It contains clear proof that the Noble Qur'an was compiled in the very era of the Messenger of Allah (peace and blessings be upon him).