Musannaf Ibn Abi Shayba 37:330

Ali ibn Mushir narrated to us, from Yahya ibn Ayyub, from Abu Zur'ah ibn 'Amr, from Abu Hurayrah, who said: "Indeed, a man will be killed on the Day of Resurrection a thousand times." 'Asim ibn Abi al-Najud said to him: "O Abu Zur'ah, a thousand times?" He replied: "By the types of ways he killed [others]."