Sayyiduna Abdullah bin al-Zubayr (may Allah be pleased with them both) said: After the prayer, the Messenger of Allah (peace and blessings be upon him) used to say: "There is no true god except Allah; we worship none but Him; He is the Owner of blessing, bounty and excellent praise. There is no true god except Allah; we are sincere to Him in religion, even if the disbelievers dislike it."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 13905