While I was offering Salât (prayer) in the mosque, Allâh's Messenger (ﷺ) called me but I did not respond to him. Later I said, "O Allâh's Messenger (ﷺ)! I was offering Salât (prayer)." He said, "Didn't Allâh say-' Answer Allâh (by obeying Him) and (His) Messenger (ﷺ) when he calls you. ' " (V. 8:24) He then said to me, Before you leave the mosque, I will teach you a Surah which is the greatest Sûrah in the Qur'ân." Then he got hold of my hand, and when he intended to leave (the mosque), I said to him, Did't you say to me, 'I will teach you a Sûrah which is the greatest Sûrah in the Qur'ân?" " He said, "Al-ḥamdu-lillâhi Rabbil- [i.e. all the praises and thanks be to Allâh, the Lord of the ' Alamîn (mankind, jinns and all that exists)] (Surat Al-Fâtiha): which is Al-Sab'a Al-Mathânî (i.e. seven repeatedly recited Verses) and the Grand Qur'ân which has been given to me." [6:1-O.B]