It is narrated from Sayyiduna Ibn Abbas (may Allah be pleased with them both) that the Messenger of Allah (peace and blessings be upon him) said in his sermon: "Indeed, it is He alone who guides to the best of manners, and it is He alone who turns away bad manners."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 10850