Husain reported on the authority of the children of Sa’d b. Mu’adh that Usaid b. Hudair used to act as their Imam. (when he fell ill) the Messenger of Allah (ﷺ) came to him inquiring about his illness. They said:Messenger of Allah, our Imam is ill. He said : When he prays sitting, pray sitting.Abu Dawud said : The chain of this tradition is not continuous (muttasil)
حَدَّثَنَا عَبْدَةُ بْنُ عَبْدِ اللَّهِ، أَخْبَرَنَا زَيْدٌ، - يَعْنِي ابْنَ الْحُبَابِ - عَنْ مُحَمَّدِ بْنِ صَالِحٍ، حَدَّثَنِي حُصَيْنٌ، مِنْ وَلَدِ سَعْدِ بْنِ مُعَاذٍ عَنْ أُسَيْدِ بْنِ حُضَيْرٍ، أَنَّهُ كَانَ يَؤُمُّهُمْ - قَالَ - فَجَاءَ رَسُولُ اللَّهِ صلى الله عليه وسلم يَعُودُهُ فَقَالُوا يَا رَسُولَ اللَّهِ إِنَّ إِمَامَنَا مَرِيضٌ . فَقَالَ " إِذَا صَلَّى قَاعِدًا فَصَلُّوا قُعُودًا " . قَالَ أَبُو دَاوُدَ هذا الْحَدِيثُ لَيْسَ بِمُتَّصِلٍ .
AbuDaud
Prayer (Kitab Al-Salat) • Hadith 607