The original work in Persian, recently published under the title “Arba’in, ya chihil hadith” was written by Imam al-Khumayni forty-six years ago and was completed in the month of Muharram 1358 (April-May, 1939).

The manuscript of this work, together with that of two other unpublished works of the author, Sharh Du’ae sahar, and Adab al-salat, were recovered from the library of the late Ayatullah Akhund al-Hamadani. All the three works have now been published.