Muwatta Malik · Hadith 904

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

Gradings are classical jarḥ-wa-taʿdīl, name-matched to a rijāl index (not individually re-verified).