Narrated Az-Zuhri:
from Anas who said: "Hudhaifah bin Al-Yaman came to 'Uthman, at the time when the people of Ash-Sham and the people of Al-'Iraq were waging war to conquer Arminiyah and Adharbijan. Hudhaifah saw their (the people of Ash-Sham and Al-'Iraq) different forms of recitation of the Qur'an. So he said to 'Uthman: 'O Commander of the Believers! Save this nation before they differ about the Book as the Jews and the Christians did before them.' So he ('Uthman) sent a message to Hafsah (saying): 'Send us the manuscripts so that we may copy them in the Musahif (plural of Mushaf: a written copy of the Qur'an) then we shall return it to you.' So Hafsah sent the manuscripts to 'Uthman bin 'Affan. 'Uthman then sent order for Zaid bin Thabit, Sa'eed bin Al-'As, 'Abdur-Rahman bin Al-Harith bin Hisham, and 'Abdullah bin Az-Zubair to copy the manuscripts in the Musahif. 'Uthman said to the three Quraish men: 'In case you disagree with Zaid bin Thabit on any point in the (recitation dialect of the) Qur'an, then write it in the dialect of Quraish for it was in their tongue.' So when they had copied the manuscripts, 'Uthman sent one Mushaf from those Musahif that they had copied to every province." Az-Zuhri said: "Kharijah bin Zaid [bin Thabit] narrated to me that Zaid bin Thabit said: 'I missed an Ayah of Surat Al-Ahzab that I heard the Messenger of Allah (ﷺ) reciting: Among the believers are men who have been true to their covenant with Allah, of them some have fulfilled their obligations, and some of them are still waiting (33:23) - so I searched for it and found it with Khuzaimah bin Thabit, or Abu Khuzaimah, so I put it in its Surah.'" Az-Zuhri said: "They differed then with At-Tabut and At-Tabuh. The Quraish said: At-Tabut while Zaid said: At-Tabuh. Their disagreement was brought to 'Uthman, so he said: 'Write it as At-Tabut, for it was revealed in the tongue of the Quraish.'" Az-Zuhri said: "'Ubaidullah bin 'Abdullah bin 'Utbah informed me that 'Abdullah bin Mas'ud disliked Zaid bin Thabit copying the Musahif, and he said: 'O you Muslims people! Avoid copying the Mushaf and the recitation of this man. By Allah! When I accepted Islam he was but in the loins of a disbelieving man' - meaning Zaid bin Thabit - and it was regarding this that 'Abdullah bin Mas'ud said: 'O people of Al-'Iraq! Keep the Musahif that are with you, and conceal them. For indeed Allah said: And whoever conceals something, he shall come with what he concealed on the Day of Judgement (3:161). So meet Allah with the Musahif.'" Az-Zuhri said: "It was conveyed to me that some men amongst the most virtuous of the Companions of the Messenger of Allah (ﷺ) disliked that view of Ibn Mas'ud."
English reference: Vol. 5, Book 44, Hadith 3104
Arabic reference: Book 47, Hadith 3387