In «كَعَصْفٍ مَأْكُولٍ», tanwīn precedes mīm, causing idghām with ghunnah, like «بِحِجَارَةٍ مِنْ» earlier.
The word «مَأْكُولٍ» contains a pronounced hamzah and a madd wāw in «كُو». When pausing on its final lām, that letter becomes sākin after the madd wāw, yielding madd ʿāriḍ li-s-sukūn. Assimilation at the beginning and lengthening at the end are independent decisions.
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Kaʿaṣfin maʾkūl: tanwīn assimilation and madd
Al-Fīl and Quraysh: Applied Iẓhār, Ikhfāʾ, Idghām, Madd and Waqf
In «كَعَصْفٍ مَأْكُولٍ», tanwīn precedes mīm, causing idghām with ghunnah, like «بِحِجَارَةٍ مِنْ» earlier.
The word «مَأْكُولٍ» contains a pronounced hamzah and a madd wāw in «كُو». When pausing on its final lām, that letter becomes sākin after the madd wāw, yielding madd ʿāriḍ li-s-sukūn. Assimilation at the beginning and lengthening at the end are independent decisions.