Bulugh al-Maram, Book 1, Hadith 40 (English)

In another narration by al-Bukhari and Muslim: "He started with the front of his head, moved them (his hands) to the nape of his neck, and then returned them to the place where he started."

وَفِي لَفْظٍ: { بَدَأَ بِمُقَدَّمِ رَأْسِهِ, حَتَّى ذَهَبَ بِهِمَا إِلَى قَفَاهُ, ثُمَّ رَدَّهُمَا إِلَى اَلْمَكَانِ اَلَّذِي بَدَأَ مِنْهُ } (46)‏.‏ ‏2 ‏- البخاري (185)‏، ومسلم (235)‏.‏

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also referenced under: Book 1, Hadith 41 (In-Book)