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After the departure of Muhammad from this world the task fell on Ibn Thabit, who specialized in the Quran, to authenticate the first and most important reference for the ummah of Muhammad. This became an urgent task after the wars of apostasy and the Battle of Yamamah in particular in which a large number of those who had committed the Quran to memory perished. Umar convinced the Khalifah Abu Bakr that the Quran should be collected in one manuscript.
During Abu Bakr's reign as caliph, he was given the task of collecting the Quranic verses from all over Arabia. Zayd finally accepted the task and, according to him, "started locating the Quranic material and collecting it from parchments, scapula, leafstalks of date palms and from the memories of men (who knew it by heart)".
When Zayd had completed his task, he left the prepared suhuf (sheets) with Abu Bakr. Before he died, Abu Bakr left the suhuf with Umar who in turn left it with his daughter Hafsah. Hafsah, Umm Salamah, and Aishah were wives of Muhammad who memorized the Qur'an.
He completed the task, compiling a version of the Quran called Mushaf, and delivered the copy to Abu Bakr."
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