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 Hazrat Jibreel (peace be upon him) appeared in the presence of the Messenger of Allah while the Holy Prophet (peace and blessings be upon him) was near the well of Banu Idhah, and said, "O Muhammad! Allah Almighty commands you to recite the Holy Qur'an on one mode (harf)," and then gradually increased it until it reached the number seven.