At an ordinary stop, the final audible nūn from tanwīn is not retained. With double ḍammah or double kasrah, the tanwīn sound is removed when stopping; the source illustrates with قَدِيرٌ and بِرَسُولٍ.
Avoid this error: do not sustain a final tanwīn nūn as though the recitation were still joining into the following word.
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Ordinary tanwīn at a stop
Meeting of Two Sākin Letters — ʿAlā Ḥaddih, Ghayr Ḥaddih and Tanwīn
At an ordinary stop, the final audible nūn from tanwīn is not retained. With double ḍammah or double kasrah, the tanwīn sound is removed when stopping; the source illustrates with قَدِيرٌ and بِرَسُولٍ.
Avoid this error: do not sustain a final tanwīn nūn as though the recitation were still joining into the following word.