(The people) stood up for prayer and the Messenger of Allah (ﷺ) was talking in whispers with a man, and he did not discontinue the conversation till his Companions dozed off; he then came and led the prayer.
Sahih Muslim Book 3, Hadith 155
← Previous Hadith (The people) stood up for prayer and the Messenger of Allah (ﷺ) was whispering to a man, and in the narration of 'Abd al-Warith (the words are): The Apostle of Allah (ﷺ) was having a private conversation with a man, and did not start the prayer till the people dozed off.

Sahih Muslim Book 3, Hadith 154 Next Hadith → I heard Anas as saying that the Companion of the Messenger of Allah (ﷺ) dozed off and then offered prayer and did not perform ablution. He (the narrator) said: I asked him if he had actually heard it from Anas. He said: By Allah. yes.

Sahih Muslim Book 3, Hadith 156