Musannaf Ibn Abi Shayba 3:4440

Hashim narrated to us, he said: Mansur narrated to us, from Ibn Sirin, who said: Na'ilah bint al-Farafisah al-Kalbiyyah said: "Whether you kill him or leave him, he used to enliven the night with one rak'ah in which he would recite the entire Qur'an." She meant that he would perform witr with it. She meant Uthman.