سنن النسائي

It was narrated from Ibrahim bin Muhammad bin Al-Muntashir that his father was in the Masjid of 'Amr bin Shurahbil and the Iqamah for prayer was said, so they were waiting for him. He said: "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.