It is narrated from Hazrat Abdur Rahman bin Abi Laila (may Allah be pleased with him) on the authority of Ubayy bin Ka'b (may Allah be pleased with him) that once the Holy Prophet (peace and blessings of Allah be upon him) was near a well of Banu Ghifar when Hazrat Jibreel (peace be upon him) appeared and said, "Your Lord commands you to teach your Ummah the Holy Qur'an on one letter." The Holy Prophet (peace and blessings of Allah be upon him) said, "I seek pardon and forgiveness from Allah, for my Ummah does not have the strength for this." So Hazrat Jibreel (peace be upon him) came again with the message and permission to recite on two letters. The Holy Prophet (peace and blessings of Allah be upon him) gave the same reply again. The third time, the same happened. The fourth time, Hazrat Jibreel (peace be upon him) came with the message to recite on seven letters and said, "Whichever letter they recite accordingly, they will do correctly."