Sunan an-Nasa'i, Volume 1, Book 6, Hadith 544 (DarusSalam) ⓘ
Ja'far bin Muhammad bin 'Ali bin Al-Husain narrated from his father, that Jabir bin 'Abdullah said: "The Messenger of Allah prayed Subh as soon as he was certain the dawn had appeared."
أَخْبَرَنَا إِبْرَاهِيمُ بْنُ هَارُونَ، قَالَ حَدَّثَنَا حَاتِمُ بْنُ إِسْمَاعِيلَ، قَالَ حَدَّثَنَا جَعْفَرُ بْنُ مُحَمَّدِ بْنِ عَلِيِّ بْنِ الْحُسَيْنِ، عَنْ أَبِيهِ، أَنَّ جَابِرَ بْنَ عَبْدِ اللَّهِ، قَالَ صَلَّى رَسُولُ اللَّهِ صلى الله عليه وسلم الصُّبْحَ حِينَ تَبَيَّنَ لَهُ الصُّبْحُ .
also referenced under: Book 6, Hadith 548 (In-Book)