Sunan Ibn Majah Book 1, Hadith 179
"The Messenger of Allah said: 'The ears are part of the head.'"
The Messenger of Allah said: "The ears are part of the head." He used to wipe his head once, and he used to wipe over the inner corners of the eyes (that are close to the nose).
"I saw the Messenger of Allah performing ablution, and he ran his little finger between his toes." (Sahih)
Another chain with similar wording.