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 ﷺ يَعُودُهُ فَقَالُوا يَا رَسُولَ اللَّهِ إِنَّ إِمَامَنَا مَرِيضٌ . فَقَالَ " إِذَا صَلَّى قَاعِدًا فَصَلُّوا قُعُودًا " . قَالَ أَبُو دَاوُدَ هذا الْحَدِيثُ لَيْسَ بِمُتَّصِلٍ .