(5) Establishing the Prayer and the Sunnah Regarding Them
كتاب إقامة الصلاة والسنة فيها
(44) Chapter: Two are a congregation
(44) باب الاِثْنَانِ جَمَاعَةٌ
Sunan Ibn Majah 973 
It was narrated that Ibn ‘Abbas said:
“I stayed overnight with my maternal aunt Maimunah, and the Prophet (ﷺ) got up during the night to perform prayer. So I got up and stood on his left. He took me by the hand and made me stand on his right.”
حَدَّثَنَا مُحَمَّدُ بْنُ عَبْدِ الْمَلِكِ بْنِ أَبِي الشَّوَارِبِ، حَدَّثَنَا عَبْدُ الْوَاحِدِ بْنُ زِيَادٍ، حَدَّثَنَا عَاصِمٌ، عَنِ الشَّعْبِيِّ، عَنِ ابْنِ عَبَّاسٍ، قَالَ بِتُّ عِنْدَ خَالَتِي مَيْمُونَةَ فَقَامَ النَّبِيُّ ـ صلى الله عليه وسلم ـ يُصَلِّي مِنَ اللَّيْلِ فَقُمْتُ عَنْ يَسَارِهِ فَأَخَذَ بِيَدِي فَأَقَامَنِي عَنْ يَمِينِهِ ‏.‏
Grade :  Sahih (Darussalam)
Reference : Sunan Ibn Majah 973
In-book reference : Book 5, Hadith 171
English translation : Vol. 1, Book 5, Hadith 973