حَدَّثَنَا عَبْدُ الرَّحْمَنِ عَنْ سُفْيَانَ عَنْ الْأَعْمَشِ عَنْ عُمَارَةَ عَنْ عَبْدِ الرَّحْمَنِ بْنِ يَزِيدَ عَنْ عَبْدِ اللَّهِ قَالَ مَا رَأَيْتُ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ صَلَّى صَلَاةً إِلَّا لِمِيقَاتِهَا إِلَّا أَنَّهُ جَمَعَ بَيْنَ الْمَغْرِبِ وَالْعِشَاءِ بِجَمْعٍ وَصَلَّى الصُّبْحَ يَوْمَئِذٍ لِغَيْرِ مِيقَاتِهَا
مسند امام احمد بن حنبل · Hadith 4137
It was narrated that 'Abdullah (RA) said: I never saw the Messenger of Allah (PBUH) offer any prayer but it was on time, except that he put together Maghrib and 'Isha' in Muzdalifah, and he prayed Fajr on that day before the time when he usually prayed it (but after ascertaining that dawn had broken).
Sanad
حَدَّثَنَا عَبْدُ الرَّحْمَنِ عَنْ سُفْيَانَ عَنْ الْأَعْمَشِ عَنْ عُمَارَةَ عَنْ عَبْدِ الرَّحْمَنِ بْنِ يَزِيدَ عَنْ عَبْدِ اللَّهِ