Hadith
وَحَدَّثَنِي عَنْ مَالِكٍ، عَنْ نَافِعٍ، أَنَّ عَبْدَ اللَّهِ بْنَ عُمَرَ، كَانَ يُصَلِّي الْمَغْرِبَ وَالْعِشَاءَ بِالْمُزْدَلِفَةِ جَمِيعًا .
Yahya related to me from Malik from Nafi that Abdullah ibn Umar used to pray maghrib and isha together at Muzdalifa
Sahih · Salim al-Hilali
Muwatta Malik 904 ·Book 20, Hadith 200·Also available on sunnah.com·