It was narrated from Ibrahim bin Muhammad Al-Muntashir, from his father, that:
He was in the masjid of 'Amr bin Shurahbil and the iqamah for prayer was said, and they were waiting. He came and said: I was praying witr. Abdullah was asked: Is there any witr after the adhan? He said: Yes, and after the Iqamah. And he narrated that the Prophet (ﷺ) once slept and missed the prayer until the sun had risen, then he prayed.