(48) باب اسْتِحْبَابِ زِيَادَةِ التَّغْلِيسِ بِصَلاَةِ الصُّبْحِ يَوْمَ النَّحْرِ بِالْمُزْدَلِفَةِ وَالْمُبَالَغَةِ فِيهِ بَعْدَ تَحَقُّقِ طُلُوعِ الْفَجْرِ
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.
Reference: Sahih Muslim 1289 b
In-book reference: Book 15, Hadith 321
USC-MSA web (English) reference(deprecated numbering scheme): Book 7, Hadith 2957