4. My father and Muhammad ibn al-Hasan ibn Ahmad ibn al-Walid both said: Muhammad ibn Yahya al-`Attar, and Ahmad ibn Idris both said, on the authority of Muhammad ibn Ahmad, ,on the authority of some our scholars, on the authority of Muhammad ibn `Ali al-Tahi, on the authority of Tahir ibn Hatim ibn Mahawayh that I wrote to al-Tayyib i.e. Abu al-Hasan Musa :

“What is the least required to recognize the Creator? Thus he wrote back: “there is nothing whatsoever like unto Him. He has always been All-Hearing, All-Knowing, All-Seeing, and He is the Mighty Doer of whatever He wills.