The Book of Prayer - Friday
وَحَدَّثَنَاهُ أَبُو بَكْرِ بْنُ أَبِي شَيْبَةَ، حَدَّثَنَا عَبْدُ اللَّهِ بْنُ إِدْرِيسَ، عَنْ حُصَيْنٍ، بِهَذَا الإِسْنَادِ قَالَ وَرَسُولُ اللَّهِ صلى الله عليه وسلم يَخْطُبُ . وَلَمْ يَقُلْ قَائِمًا .This hadith has been narrated by Husain with the same chain of transmitters but with this alteration that he did not make mention of the standing position
From Sahih Muslim, whose reports the scholars accept as authentic.