here we see from musnad imam ahmad, that the final recitation is that of abdullah bin masood

“abu zeban says we asked ibn abbas whose recitation is final? that of abdullah bin masood or zaid bin thabit? we said that of zaid bin thabit? ibn abbas said; no, holy prophet asws would recite holy quran once every year with jibrail, but in the last year of his death, he recited it twice, and the final qiraat is that of abdullah bin masood”

[musnad ahmad, vol 2, page 459]

shiekh shoaib says isnaad sahih

ahmad shakir says isnaad sahih
[3.439]

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