Sahih Muslim 646
Sahih Muslim · Book 5: The Book of Mosques and Places of Prayer · It is recommended to pray Subh early, at the beginning of its time, when it is still dark; and the length of recitation therein
Muhammad b. 'Amr al-Hasan b. 'All reported:
وَحَدَّثَنَاهُ عُبَيْدُ اللَّهِ بْنُ مُعَاذٍ ، حَدَّثَنَا أَبِي ، حَدَّثَنَا شُعْبَةُ ، عَنْ سَعْدٍ ، سَمِعَ مُحَمَّدَ بْنَ عَمْرِو بْنِ الْحَسَنِ بْنِ عَلِيٍّ ، قَالَ كَانَ الْحَجَّاجُ يُؤَخِّرُ الصَّلَوَاتِ فَسَأَلْنَا جَابِرَ بْنَ عَبْدِ اللَّهِ بِمِثْلِ حَدِيثِ غُنْدَرٍ .
Hajjaj used to delay the prayers, and so we asked Jabir b. 'Abdullah, and the rest of the hadith is the same.