Musnad Ahmad 1304:0

From the hadith of Asma bint Yazid: She said: The Messenger of Allah (ﷺ) said: "Shall I not inform you of the best among you?" They said: "Yes, O Messenger of Allah." He said: "The best among you are those who, when they are seen, Allah is remembered." She said: And he said: "Shall I not inform you of the worst among you?" They said: "Yes, O Messenger of Allah." He said: "The tale-bearers, those who cause separation between loved ones, and those who seek to find fault with the innocent."