let us pay attention to this narration from musnad imam ahmad


“khamir says that once order was issued to change copies of quran (molvi zafar’s note:- no other arrangement should be left except that by uthman), so when ibn masood came to know about it, he said:- whosoever can hide his copy, he should hide it because you will come with that on the day of qayamat what you have hidden; then he said:- i had heard 70 surahs from the tongue of holy prophet asws, should i leave what i have heard from the tongue of holy prophet asws?”



sheikh ahmad shakir says isnaad sahih