The Messenger of Allah ﷺ prayed the dawn prayer when the dawn became clear to him.
أخبرنا إبراهيم بن هارون قال حدثنا حاتم بن إسمعيل قال حدثنا جعفر بن محمد بن علي بن الحسين عن أبيه أن
صلى رسول الله ﷺ الصبح حين تبين له الصبح
No references are available.
Muslim reported it in the Hajj, chapter on the Hajj of the Prophet, h: 1218, from the hadith of Hatim, in full, and this is a portion of it. It is also in Kubra, h: 1525.