Abdur Rahman bin Mahdi عبد الرحمن بن مهدي · The Book of the Times (of Prayer)

"I was praying Witr, and 'Abdullah was asked: 'Is there any Witr after the Adhan?' He said: "Yes, and after the Iqamah, and he narrated that the Prophet (ﷺ) slept and missed the prayer until the sun rose then prayed.'" And the wording is that of Yahya.