Musnad Abu Ya'la al-Mawsili 131:4

Abu Khaythama narrated to us, Abd al-Rahman narrated to us, from Sufyan, from al-Mukhtar ibn Fulful, from Anas, who said: A man said to the Prophet, peace and blessings of Allah be upon him, "O best of creation!" He said, "That is Ibrahim, peace be upon him."