Musnad Ahmad 1304:39

'Abd al-Razzaq narrated to us, Ma'mar informed us, from Ibn Khuthaym, from Shahr ibn Hawshab, from Asma' bint Yazid, that the Prophet, peace and blessings of Allah be upon him, said: "Shall I not inform you of the best among you?" They said: "Yes, O Messenger of Allah." He said: "Those who, when they are seen, Allah the Exalted is remembered." Then he said: "Shall I not inform you of the worst among you? Those who go about with slander, those who cause corruption between those who love one another, and those who seek distress for the innocent."