What are the supplications that reassure the heart and remove whispers and anxiety?

The greatest thing that removes fear and anxiety and brings tranquility is the remembrance of Allah Almighty, relying on Him, trusting Him, and depending on Him, and being certain that all matters are in His hand. Allah Almighty says: "Unquestionably, by the remembrance of Allah hearts are assured." This includes the morning and evening remembrances and supplications, among which is the supplication of the Prophet, peace and blessings be upon him: "O Allah, I ask You for well-being in this world and the Hereafter..." and the supplication: "I seek refuge in the perfect words of Allah from His wrath and punishment, from the evil of His servants, and from the whisperings of devils and that they should approach me."