Hadith 1031
Chapter 349: Those Who Said He Should Complete (The Prayers) Based Upon His Strongest Judgement - كتاب الصلاة
حَدَّثَنَا حَجَّاجُ بْنُ أَبِي يَعْقُوبَ، حَدَّثَنَا يَعْقُوبُ، حَدَّثَنَا ابْنُ أَخِي الزُّهْرِيِّ، عَنْ مُحَمَّدِ بْنِ مُسْلِمٍ، بِهَذَا الْحَدِيثِ بِإِسْنَادِهِ زَادَ " وَهُوَ جَالِسٌ قَبْلَ التَّسْلِيمِ " .
This tradition has also been transmitted by Muhammad b. Muslim through a different chain of narrators. This version adds; “While he is sitting before he gives the salutation.”
Reference : Sunan Abi Dawud 1031
In-book reference : Book 2, Hadith 642