For fāʾ (ف), the book names the lower lip and the edge of the upper front teeth. This is not a complete closure of both lips; that belongs to the next point.
Practice فَ، فِ، فُ، أَفْ. Keep the tongue out of the contact. If both lips are pressed together, the sound will not be an accurately articulated fāʾ.
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Point 12: Lower lip and upper incisors — fāʾ
Makhārij al-Ḥurūf — The Fifteen Articulation Points
For fāʾ (ف), the book names the lower lip and the edge of the upper front teeth. This is not a complete closure of both lips; that belongs to the next point.
Practice فَ، فِ، فُ، أَفْ. Keep the tongue out of the contact. If both lips are pressed together, the sound will not be an accurately articulated fāʾ.