أَخْبَرَنَا إِسْحَاقُ بْنُ مَنْصُورٍ، قَالَ حَدَّثَنَا أَبُو دَاوُدَ، قَالَ حَدَّثَنَا شُعْبَةُ، عَنْ قَتَادَةَ، عَنْ زُرَارَةَ، عَنْ عَبْدِ الرَّحْمَنِ بْنِ أَبْزَى، عَنْ رَسُولِ اللَّهِ صلى الله عليه وسلم كَانَ يُوتِرُ بِـ { سَبِّحِ اسْمَ رَبِّكَ الأَعْلَى } وَ { قُلْ يَا أَيُّهَا الْكَافِرُونَ } وَ { قُلْ هُوَ اللَّهُ أَحَدٌ } فَإِذَا فَرَغَ قَالَ " سُبْحَانَ الْمَلِكِ الْقُدُّوسِ " . ثَلاَثًا وَيَمُدُّ فِي الثَّالِثَةِ .
Ishawq bin Mansur informed us, he said: "Abu Dawud narrated to us, he said: Shu'ba narrated to us, from Qatadah, from Abdur-Rahman bin Abza, thatThe Messenger of Allah (PBUH) used to recite in witr: Glorify the Name of your Lord, the Most High;" and "Say: O you disbelievers!;' and 'Say: He is Allah, (the) One.' And when he said the taslim, he would say: Subhanal-Malikil-Quddus (Glory be to the Sovereign, the Most Holy) three times, elongating his words the third time." Translation Not Available
Book Ref: Sunan An Nisai Book 20 Hadith 1741
Web Ref: Sunan An Nisai Vol 2 Book 20 Hadith 1742