(Imām Bukhārī narrates): Abū al-Yamān narrated to us, he said: Shu'aib informed us, he said: Abū al-Zinād informed us, from al-A'raj, from Abū Hurairah, may Allāh be pleased with him, he narrates that the Prophet ﷺ said:

The imām is appointed only so that he may be followed; so when he pronounces the takbīr, you pronounce the takbīr; and when he performs rukū', you perform rukū'; and when he says "Sami'a Allāhu liman hamidah", you say "Rabbanā wa laka al-hamd"; and when he performs sajdah, you perform sajdah; and when he prays sitting, all of you pray sitting.