Du'a Simat (Arabic: دعاء السمات), also known as Du'a Shobbur, is an Islamic supplication. This Du'a is mustahab (recommended) to be recited at sunset on Fridays. It is regarded as a prominent supplication. Most old Islamic scholars followed this practice. Muhammad al-Baqir, the fifth Imam of Shia Islam, said, 'I've spoken the truth if I swear to Allah that Ismul Azam is in this supplication." According to Allamah Mohammad Baqir Majlisi, the companions of the Prophet recited it regularly.