Hadith 416
Abu Hurairah (RA) reported: The Messenger of Allah (ﷺ) said: Verily the Imam is a shield, say prayer sitting when he says prayer sitting. And when he says: "Allah listens to him who praises Him," say: "O Allah, our Lord, to Thee be the praise." and when the utterance of the people of the earth synchronises with that of the beings of heaven (angels), all the previous sins would be pardoned.
Hadith 1835
This hadith has been narrated on the authority of Abu Hurairah (RA) by more than one chain of transmitters.
Hadith 2231
'Amr bin Sharid reported on the authority of his father that there was in the delegation of Thaqif a leper. Allah's Apostle (ﷺ) sent a message to him: We have accepted your allegiance, so you may go.