It is narrated from Sayyiduna Mu'awiyah (may Allah be pleased with him) that he said: I heard the Messenger of Allah (peace and blessings be upon him) say: "If you pursue people's faults, you will corrupt them, or nearly corrupt them." The narrator says: Sayyiduna Abu al-Darda' (may Allah be pleased with him) used to say: This is a word that Sayyiduna Mu'awiyah (may Allah be pleased with him) heard from the Messenger of Allah (peace and blessings be upon him), and Allah benefited him through it.
Hadith Referenceالمعجم الكبير للطبراني / باب الميم / 16939
Sayyiduna Mu'awiyah bin Abi Sufyan (may Allah be pleased with him) used to stand on the pulpit and teach the people the tashahhud as narrated from the Prophet (peace and blessings be upon him): "All verbal, physical and financial acts of worship are for Allah. Peace be upon you, O Prophet, and the mercy of Allah and His blessings. Peace be upon us and upon the righteous servants of Allah. I bear witness that there is no true god except Allah, and I bear witness that Muhammad (peace and blessings be upon him) is His servant and His Messenger."
Hadith Referenceالمعجم الكبير للطبراني / باب الميم / 16940