Laylat al-Qadr
Muslims often read the Jawshan kabir in Laylat al-Qadr in Ramadan but some Hadiths recommend reading it at the beginning of Ramadan. Imam Ali said to his son, Husayn ibn Ali, to memorize and write this supplication on his "kafan" (burial shroud). Also, there are several hadiths from the prophet Muhammad that state that whoever recites this prayer will receive rewards in the world and Akhirah. Abbas Qumi wrote the prayer in his book "Mafatih al-Janan".