Narrated Abdullah ibn Abbas:Kurayb the freed slave of Ibn Abbas reported: Abdullah ibn Abbas saw Abdullah ibn al-Harith praying having the back knot of the hair. He stood behind him and began to untie it. He remained standing unmoved (stationary). When he finished his prayer he came to Ibn Abbas and said to him: What were you doing with my head? He said: I heard the Messenger of Allah (ﷺ) say: A man who prays with the black knot of hair tied is the one praying pinioned.
حَدَّثَنَا مُحَمَّدُ بْنُ سَلَمَةَ، حَدَّثَنَا ابْنُ وَهْبٍ، عَنْ عَمْرِو بْنِ الْحَارِثِ، أَنَّ بُكَيْرًا، حَدَّثَهُ أَنَّ كُرَيْبًا مَوْلَى ابْنِ عَبَّاسٍ حَدَّثَهُ أَنَّ عَبْدَ اللَّهِ بْنَ عَبَّاسٍ رَأَى عَبْدَ اللَّهِ بْنَ الْحَارِثِ يُصَلِّي وَرَأْسُهُ مَعْقُوصٌ مِنْ وَرَائِهِ فَقَامَ وَرَاءَهُ فَجَعَلَ يَحُلُّهُ وَأَقَرَّ لَهُ الآخَرُ فَلَمَّا انْصَرَفَ أَقْبَلَ إِلَى ابْنِ عَبَّاسٍ فَقَالَ مَا لَكَ وَرَأْسِي قَالَ إِنِّي سَمِعْتُ رَسُولَ اللَّهِ صلى الله عليه وسلم يَقُولُ " إِنَّمَا مَثَلُ هَذَا مَثَلُ الَّذِي يُصَلِّي وَهُوَ مَكْتُوفٌ " .
AbuDaud
Prayer (Kitab Al-Salat) • Hadith 647