Hadith from Muslim:
Al-Bara’ (May Allah be pleased with him) reported: Whenever we performed Salat behind the Messenger of Allah (Peace be upon him), we liked to be on his right side so that his face might turn towards us (at the end of the Salah). One day, I heard Messenger of Allah (Peace be upon him) supplicating, “O my Rubb! Shield me from Your Torment on the Day when You will gather (or said, `resurrect’) Your slaves.”
[Muslim].