This supplication is also called Dua al-Shubur. It is advisable to say this supplication at the last hour of Fridays. It is well-known that Dua al-Simat is one of the famous supplications, which was regularly said by the past scholars. This supplication is recorded in Shaykh al-Tusi’s book of Misbah al-Mutahajjid, Sayyid Ibn Tawus’s book of Jamal al-Usbu’, and al-Kaf’ami’s books through an authentic series of narrators on the authority of Muhammad ibn ‘Uthman al-’Umari, one of the Four Envoys of Imam al-Mahdi, peace be upon him. The supplication has been also reported from Imam Muhammad al-Baqir and Imam Ja’far al-Sadiq, peace be upon them. With commentary, al-Majlisi has also narrated the supplication in his famous book of Bihar al-Anwar. The following form is quoted from Shaykh al-Tusi’sMisbah al-Mutahajjid: