When أَفْوَاجًا فَسَبِّحْ is connected across the verse boundary, the tanwīn is followed by fāʾ, which triggers ikhfāʾ with ghunnah.
Compare:
Pause: «أَفْوَاجَا» — madd ʿiwaḍ.
Connect: «أَفْوَاجًا فَسَبِّحْ» — ikhfāʾ of tanwīn.
The rule changes because the manner of recitation changes.
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Afwājan fa-sabbiḥ: ikhfāʾ in continuation
Al-Kāfirūn and An-Naṣr: Applied Madd, Idghām, Ghunnah and Waqf
When أَفْوَاجًا فَسَبِّحْ is connected across the verse boundary, the tanwīn is followed by fāʾ, which triggers ikhfāʾ with ghunnah.
Compare:
Pause: «أَفْوَاجَا» — madd ʿiwaḍ.
Connect: «أَفْوَاجًا فَسَبِّحْ» — ikhfāʾ of tanwīn.
The rule changes because the manner of recitation changes.