17. My father and Muhammad ibn al-Hasan ibn Ahmad ibn al-Walid both said: Sa`d ibn `Abd Allah said, on the authority of Ahmad ibn Muhammad ibn `Isa, on the authority of `Ali ibn `Abd Allah, on the authority of Muhammad ibn Abu `Umayr, on the authority of Abu al-Hasan al-Hadhdha’, on the authority of al-Mu`alla ibn Khunays I asked Abu `Abd Allah al-Sadiq : “What is the meaning of the word of the Mighty and High: And, verily, they were called upon to make obeisance while yet they were safe.” He replied, “They had the ability.”