When يَوْمَئِذٍ عَنِ is connected, kasrah tanwīn is followed by ʿayn, a throat letter. Therefore the correct rule is iẓhār ḥalqī, not idghām.
If stopping on «يَوْمَئِذٍ», the tanwīn-nūn is not sounded and final dhāl becomes sākin.
Practice linked «yawmaʾidhin ʿani» and paused «yawmaʾidh», then explain why the rulings differ.
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Tanwīn iẓhār in yawmaʾidhin ʿani
Al-ʿAṣr and At-Takāthur: Applied Ghunnah, Madd, Lām and Waqf
When يَوْمَئِذٍ عَنِ is connected, kasrah tanwīn is followed by ʿayn, a throat letter. Therefore the correct rule is iẓhār ḥalqī, not idghām.
If stopping on «يَوْمَئِذٍ», the tanwīn-nūn is not sounded and final dhāl becomes sākin.
Practice linked «yawmaʾidhin ʿani» and paused «yawmaʾidh», then explain why the rulings differ.