(69) باب الإِمَامِ يُصَلِّي مِنْ قُعُودٍ
Jabir said :
when the prophet (ﷺ) became seriously ill, we prayed behind him while he was sitting and Abu Bakr was calling "Allah is most great " to cause the people to hear the TAKBIR. Then he (the narrators) narrated the rest of the tradition.
Reference: Sunan Abi Dawud 606
In-book reference: Book 2, Hadith 216
English translation: Book 2, Hadith 606