Sunan Ibn Majah Book 5, Hadith 157

“The Messenger of Allah (ﷺ) forbade performing prayer behind one who is engaged in conversation or one who is sleeping.”

Previous Hadith

“The Prophet (ﷺ) used to perform prayer when I was opposite to him, and his garment would sometimes touch me when he prostrated.”

Sunan Ibn Majah Book 5, Hadith 156
Next Hadith

“The Prophet (ﷺ) used to teach us not to bow or prostrate before the Imam; when he says the Takbir then say the Takbir, and when he prostrates, you should prostrate.”

Sunan Ibn Majah Book 5, Hadith 158