Khālid ibn Yazīd, from Sa'īd ibn Abī Hilāl, who reported that Zayd ibn Aslam had narrated to him from 'Atā' ibn Yasār, who said:

A man came to Ka'b while he was among a group of people and said, “O Abū Ishāq, tell me about the Compeller.” Those present were appalled at his words, but Ka'b said, “Leave the man be. If he is ignorant, he will learn; and if he is knowledgeable, he will gain further knowledge.”

Then Ka'b said, “I tell you that Allah created seven heavens and the same number of earths. Then He made the distance between every two heavens like that between