Ubayy b. Ka‘b told of God’s messenger meeting Gabriel and saying, “I have been sent, Gabriel, to a people who are unlettered, among whom are old women and old men, boys and girls, and men who have never read a book.” He replied, “The Qur’ān, Muhammad, has been sent down in seven modes." In a version by Ahmad and Abū Dāwūd he said, “They include only what is sufficiently health-giving.” In a version by Nasā’i the Prophet is quoted as saying that Gabriel and Michael came to him, and when Gabriel had sat down at his right and Michael at his left, Gabriel told him to recite the Qur’ān in one mode, and Michael told him to ask more, till he reached seven modes, each mode being sufficiently health-giving. Tirmidhī transmitted it.