أَخْبَرَنَا سُوَيْدُ بْنُ نَصْرٍ، قَالَ حَدَّثَنَا عَبْدُ اللَّهِ، عَنْ عَبْدِ الْمَلِكِ بْنِ أَبِي سُلَيْمَانَ، عَنْ عَطَاءٍ، عَنِ ابْنِ عَبَّاسٍ، قَالَ صَلَّيْتُ مَعَ رَسُولِ اللَّهِ صلى الله عليه وسلم فَقُمْتُ عَنْ يَسَارِهِ فَأَخَذَنِي بِيَدِهِ الْيُسْرَى فَأَقَامَنِي عَنْ يَمِينِهِ ‏.‏

It was narrated that Ibn Abbas said: "I prayed with the Messenger of Allah (PBUH)and I stood on his left. He took hold of me with his left hand and made me stand on his right." Translation Not Available

Book Ref: Sunan An Nisai Book 10 Hadith 842
Web Ref:  Sunan An Nisai Vol 1 Book 10 Hadith 843