In لَكُمْ دِينُكُمْ وَلِيَ دِينِ, the yāʾ of «وَلِيَ» carries fatḥah; it is not a madd letter to prolong. By contrast, the yāʾ in «دِينِ» is sākin after a kasrah and is a genuine madd letter.
Spotting a written yāʾ is insufficient: inspect whether it has a vowel and the preceding vowel. Stopping on final «دِينِ» introduces a further temporary sukūn.
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Last verse: is every yāʾ a madd letter?
Al-Kāfirūn and An-Naṣr: Applied Madd, Idghām, Ghunnah and Waqf
In لَكُمْ دِينُكُمْ وَلِيَ دِينِ, the yāʾ of «وَلِيَ» carries fatḥah; it is not a madd letter to prolong. By contrast, the yāʾ in «دِينِ» is sākin after a kasrah and is a genuine madd letter.
Spotting a written yāʾ is insufficient: inspect whether it has a vowel and the preceding vowel. Stopping on final «دِينِ» introduces a further temporary sukūn.