Musnad Ahmad 28:28

Abu Mu'awiyah narrated to us, Al-A'mash narrated to us, from Shaqiq, from Masruq, from Abdullah ibn Amr ibn al-As, that the Messenger of Allah (peace and blessings of Allah be upon him) was neither indecent nor did he seek indecency. And he used to say: "Among the best of you are those with the best characters."