Dua Al-Jawshan Al-Kabir is a prayer that consists of 1001 names and attributes of God. According to Islamic tradition, Angel Jabra'il (Gabriel) brought this prayer to the Prophet Muhammad (PBUH) to protect him from harm. Jibra'il instructed the Prophet to recite this prayer as it would act as an armor to protect him and his followers from any harm. The prayer became known as his "Jawshan" or heavy armor, which the prophet Muhammad (PBUH) wore in battles.