Musnad Ahmad 30:1411

'Affan narrated to us, he said: Wuhayb narrated to us, Ma'mar narrated to us, from al-Zuhri, from Sa'id ibn al-Musayyib, from Abu Hurayrah, from the Prophet, peace and blessings of Allah be upon him, who said: "If one of you spends the night and there is grease on his hand, and something befalls him, then let him blame none but himself."