Musnad Ahmad 1060:84

Yazid narrated to us, Hajjaj ibn Artah informed us, from Makhul; and Muhammad ibn Yazid narrated to us, from Hajjaj, from Makhul, who said: Abu Ayyub said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "Four are from the practices of the messengers: applying perfume, marriage, using the miswak, and modesty."