The IMAM is appointed only to be followed; so when he prays standing. Pray standing ; and when he raises himself, raise yourself: and when he prays sitting. Pray sitting.

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.

Abu Dawud said : The chain of this tradition is not continuous (muttasil)

The Messenger of Allah (ﷺ) entered upon Umm Haram. The people (in her house) brought some cooking oil dates to him. He said; Put it (dates) back in its container and return it (cooking oil) to its bag, because I am keeping fast. He then stood and led us in prayer two Rak’ahs of supererogatory prayer. Then Umm Sulaim and Umm Haram stood behind us (i.e., the men). Thabit (the narrator) said: I understand that Anas said; he (the prophet) made me stand on his right side.

The Messenger of Allah (ﷺ) led him and one of their women in prayer. He (the prophet) put him on his right side and the woman behind him (Anas)

when I was spending a night in the house of my maternal aunt Maimunah, the Messenger of Allah (ﷺ) got up at night, opened the mouth of the water skin and performed ablution. He then closed the mouth of the water-skin and stood for prayer. Then I got up and performed ablution as he did ; then I came and stood on his left side. He took my hand, turned me round behind his back and set me on his right side; and I prayed along with him.

“He took my head or the hair of my head and made me stand on his right side”.

Get up, I shall lead you in prayer. Anas said: I got up and took a mat which had become black on account of long use. I then washed it with water. The Messenger of Allah (ﷺ) stood upon it. I and the orphan (Ibn Abi Dumairah, the freed slave of the prophet) stood in a row behind him. The old women stood behind us. He then led us in two raka'at of prayer and left.

Alqamah and al-Aswad sought permission from Abdullah (ibn Mas'ud) for admission, and we remained sitting at his door for a long time. A slave-girl came out and gave them permission (to enter). He (Ibn Mas'ud) then got up and prayed (standing) between me (al-Aswad) and him (Alqamah). He then said: I witnessed the Messenger of Allah (ﷺ) doing similarly.

Jabir ibn Yazid ibn al-Aswad reported on the authority of his father: I prayed behind the Messenger of Allah (ﷺ). When he finished the prayer, he would turn (his face from the direction of the Ka'bah).

When we would pray behind the Messenger of Allah (ﷺ), we liked to be on his right side. He (the Prophet) would sit turning his face towards us (and back towards the Ka'bah) (ﷺ).

The Prophet (ﷺ) said: The Imam should not pray at the place where he led the prayer until he removes (from there).

Abu Dawud said: 'Ata' al-Khurasani did not see Mughirah b. Shu'bah (This tradition is, therefore munqati', i.e. a link is missing in the chain).

The Prophet (ﷺ) said: When the Imam completes the prayer and sits (for reciting tashahhud), and then becomes defiled (i.e. his ablution becomes void) before he speaks (to someone), his prayer becomes complete. And those who prayed behind him also complete the prayer.

The Prophet (ﷺ) said: The key of prayer is purification; takbir (saying "Allah is most great") makes (all acts which break prayer) unlawful and taslim (uttering the salutation) makes (all such acts) lawful.

The Prophet (ﷺ) said: Do not try to outstrip me in bowing and prostrating because however earlier I bow you will join me when I raise (my head from bowing); I have become bulky.

Al-Bara who is not a liar said; when they (the companions) raised their heads from bowing along with the Messenger of Allah (ﷺ), they would stand up, and when they saw him that he went down in prostration, they would prostrate (following the prophet).

Al-Bara b.‘Azib said ; we used to pray along with the prophet (ﷺ); none of us bowed his back until he saw that the prophet (ﷺ) bowed (his back).

then they would follow him (ﷺ)

Abu Hurairah reported the Messenger of Allah (ﷺ) as saying; Does he who raises his head while the Imam is prostrating not fear that Allah may change his head into a donkey’s or his face into a donkey’s face.

The prophet (ﷺ) persuaded them to say prayer in congregation and prohibited them to leave before he goes away from the prayer.