who said: Al-Sadiq said: Taqiyya was binding upon my fathers before me after Cain [Qabil] killed Abel [Habil] for disclosing the secret of Allah; and it is my religion and the religion of my fathers.

And by the chain of narration from Zayd ibn Talha, from Ali ibn Abd al-Malik, from Sharik, from al-Mufaddal ibn Umar, who said: Al-Sadiq said—and from Abdullah ibn al-Ala, from Idris, from Zayd ibn Talha, from Yunus ibn Dhabyan, from our Master the Scholar—peace be upon him—that he said: The manifestation [Zuhur] of Allah among His servants is a secret, and His knowledge among them is continuous. So what you have known is kept hidden from those other than you. Be upon our way and our methodology, for if Allah the Exalted had willed to tear away what He has veiled, no one would have denied it, but [He did so] to test some of you with others.

The author of "The Egyptian Treatise" [Al-Risala al-Misriyya]—may Allah sanctify him—cited in its first chapter a narration from Abdullah ibn al-Ala, from Idris, from Hisham, from al-Mufaddal ibn Umar, who said: Our Master al-Sadiq—mercy be from him—said:

Taqiyya has been binding upon the believers since Cain killed Abel.

This is supported by what he [the author]—may Allah sanctify him—cited in the third chapter of the aforementioned treatise, saying: It was narrated that the Higher Worlds [Al-Awalim al-Ulwiya] asked the Master (the Exalted) to lighten for their brothers among humanity the