Sayyiduna Ka'b bin Amr al-Yami (may Allah be pleased with him) said: I saw the Messenger of Allah (peace and blessings be upon him) wipe his head from the front to the back, and he brought his two hands out from beneath his two ears.
Hadith Referenceالمعجم الكبير للطبراني / باب الكاف / 16457