Ali b. Suwayd narrates, 'I wrote a letter to Abu al-Hasan Musa b. Ja'far (AS), when he was in captivity, in which I inquired about his health and about many other issues. He held back the Imam Masa b. Ja'far al-Kazim (AS) reply from me for months, then he replied in a letter, the text of which is as follows: 'In the name of Allah, the Beneficent, the Merciful ... Certainly you are a man who has been bestowed a special rank by Allah with the household of Muhammad and has guarded you among those who look after His religion ...'