Sayyiduna al-Miqdam bin Ma'di Karib (may Allah be pleased with him) said: "I saw the Prophet (peace and blessings be upon him) perform ablution. When he reached the wiping of his head, he placed both his palms on the front of his head, then passed them back until he reached the nape of his neck, then brought them back to the place from where he had started."
Hadith Referenceالمعجم الكبير للطبراني / باب الميم / 17790