Musnad Ahmad 30:1543

Aswad ibn Amir narrated to us, Sharik narrated to us, from al-A’mash, from Abu Salih, from Abu Hurairah, who said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "Whatever I have forbidden you from, then refrain from it. And whatever I have commanded you to do, then take from it as much as you are able."