The Book of Pilgrimage
وَحَدَّثَنَا عُثْمَانُ بْنُ أَبِي شَيْبَةَ، وَإِسْحَاقُ بْنُ إِبْرَاهِيمَ، جَمِيعًا عَنْ جَرِيرٍ، عَنِ الأَعْمَشِ، بِهَذَا الإِسْنَادِ وَقَالَ قَبْلَ وَقْتِهَا بِغَلَسٍ .This hadith has been transmitted by Al-A`mash with a slight variation of words, i.e. he said before its time when it was still dark
From Sahih Muslim, whose reports the scholars accept as authentic.