1. My father said: Sa`d ibn `Abd Allah said, on the authority of Ahmad ibn Muhammad ibn `Isa, on the authority of Muhammad ibn Sinan, on the authority of al-`Ala ibn Fudayl that I asked Abu `Abd Allah al-Sadiq to interpret the Word of Allah, the Mighty and High: The nature made by Allah is which He has made men. He said: “It is Divine Unity.”