Harun ibn Sa'id al-Ayli narrated to us, Ibn Wahb narrated to us, Sulayman—who is Ibn Bilal—informed me, from al-'Ala' ibn 'Abd al-Rahman, who narrated to him from his father, from Abu Hurayrah, that the Messenger of Allah, peace and blessings be upon him, said: "It is not fitting for a truthful and sincere person to be one who curses much."