وَالْمَفْرُوضُ فِي مَسْحِ الرَّأْسِ مِقْدَارُ النَّاصِيَةِ، وَهُوَ رُبْعُ الرَّأْسِ
Meaning: The obligatory wiping of the head is the extent of the forelock, equal to one quarter of the head.
Nasiyah refers to the front of the head. The passage defines a minimum extent rather than making wiping the entire head obligatory.
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Taharah and Wudu Obligations: Limits, Evidence and Juristic Differences
وَالْمَفْرُوضُ فِي مَسْحِ الرَّأْسِ مِقْدَارُ النَّاصِيَةِ، وَهُوَ رُبْعُ الرَّأْسِ
Meaning: The obligatory wiping of the head is the extent of the forelock, equal to one quarter of the head.
Nasiyah refers to the front of the head. The passage defines a minimum extent rather than making wiping the entire head obligatory.