What is the ruling on saying: "Allah is Truth"?

There is no problem with the validity of saying "Allah is The Truth (Al-Haqq)," for Al-Haqq is one of Allah’s Beautiful Names, as stated in the Holy Quran: "That is because Allah is the Truth" and "And that Allah is the manifest Truth." The Prophet, peace and blessings be upon him, used to supplicate saying: "You are the Truth, and Your promise is true, and the meeting with You is true, and Your word is true, and Paradise is true, and Hell is true, and the Prophets are true, and Muhammad, peace and blessings be upon him, is true, and the Hour is true." "Al-Haqq" means that Allah is the only One who exists in reality, and every deity worshipped besides Him is false. It also means that all His commands, prohibitions, promises, and warnings are true and must be obeyed.