Bulugh al-Maram 1 The Book of Purification كتاب الطهارة 41

وَفِي لَفْظٍ: { بَدَأَ بِمُقَدَّمِ رَأْسِهِ, حَتَّى ذَهَبَ بِهِمَا إِلَى قَفَاهُ, ثُمَّ رَدَّهُمَا إِلَى اَلْمَكَانِ اَلَّذِي بَدَأَ مِنْهُ } 1 . 1 – البخاري (185)، ومسلم (235).

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.”