Sunan an-Nasai Book 10, Hadith 808

أَخْبَرَنَا مُحَمَّدُ بْنُ عُمَرَ بْنِ عَلِيِّ بْنِ مُقَدَّمٍ، قَالَ حَدَّثَنَا يُوسُفُ بْنُ يَعْقُوبَ، قَالَ أَخْبَرَنِي التَّيْمِيُّ، عَنْ أَبِي مِجْلَزٍ، عَنْ قَيْسِ بْنِ عَبَّادٍ، قَالَ بَيْنَا أَنَا فِي الْمَسْجِدِ، فِي الصَّفِّ الْمُقَدَّمِ فَجَبَذَنِي رَجُلٌ مِنْ خَلْفِي جَبْذَةً فَنَحَّانِي وَقَامَ مَقَامِي فَوَاللَّهِ مَا عَقَلْتُ صَلاَتِي فَلَمَّا انْصَرَفَ فَإِذَا هُوَ أُبَىُّ بْنُ كَعْبٍ فَقَالَ يَا فَتَى لاَ يَسُؤْكَ اللَّهُ إِنَّ هَذَا عَهْدٌ مِنَ النَّبِيِّ صلى الله عليه وسلم إِلَيْنَا أَنْ نَلِيَهُ ثُمَّ اسْتَقْبَلَ الْقِبْلَةَ فَقَالَ هَلَكَ أَهْلُ الْعُقَدِ وَرَبِّ الْكَعْبَةِ ثَلاَثًا ثُمَّ قَالَ وَاللَّهِ مَا عَلَيْهِمْ آسَى وَلَكِنْ آسَى عَلَى مَنْ أَضَلُّوا ‏.‏ قُلْتُ يَا أَبَا يَعْقُوبَ مَا يَعْنِي بِأَهْلِ الْعُقَدِ قَالَ الأُمَرَاءُ ‏.‏

It was narrated that Qais bin 'Ubad said:"While I was in the Masjid in the first row, a man pulled me from behind and moved me aside, and took my place. By Allah, I could not focus on my prayer, then when he left I saw that it was Ubayy bin Ka'b. He said: '0 boy, may Allah protect you from harm. This is what the Prophet instructed us to do, to stand directly behind him.' Then he (Ubayy) turned to face the Qiblah and said: 'Doomed are Ah1 Al-'Uqd, by the Lord of the Ka'bah! - three times.'Then he said: 'By Allah, I am not sad for them, but I am sad for the people whom they have misled.' I said: '0 Abu Ya'qub, what do you mean by Ah1 Al-'Uqd?' He said: 'The rulers