It was narrated from Abu Saeed bin Al-Mu’alla that the Prophet صلی اللہ علیہ وآلہ وسلم, passed by him when he was praying, and called him. He said: “I finished praying, then I came to him, and he said: ‘What kept you from answering me?’ He said: ‘I was praying.’ He said: ‘Does not Allah say: you who believe! Answer Allah (by obeying Him) and (His) Messenger when he calls you to that which will give you life? Shall I not teach you the greatest Sarah before I leave the Masjid?’ Then he went to leave, and I said: ‘Messenger of Allah صلی اللہ علیہ وآلہ وسلم, what about what you said?’ He said: “All the praise and thanks be to Allah, the Lord of all that existsJ These are the seven oft- recited that I have been given, and the Grand Qur’an.” (Sahih)