Sahih Muslim
Sahih Muslim 646 b
It is recommended to pray Subh early, at the beginning of its time, when it is still dark; and the length of recitation therein
Arabic hadith text
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
Translation
Muhammad b. 'Amr al-Hasan b. 'All reported
Hajjaj used to delay the prayers, and so we asked Jabir b. 'Abdullah, and the rest of the hadith is the same.