In مَالًا وَعَدَّدَهُ, tanwīn meets wāw, a letter of the nasalized idghām group. The result is idghām with ghunnah, followed by a properly articulated wāw.
Contrast the lām after tanwīn in waylun li-kulli, which takes no ghunnah. Also distinguish pausing on مَالًا: ordinary fatḥ-tanwīn at a pause is replaced by a madd ʿiwaḍ rather than by connected assimilation.
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Mālan wa-ʿaddadahu: assimilation with ghunnah
Al-Māʿūn and Al-Humazah: Applied Assimilation, Concealment, Madd and Hāʾ Rules
In مَالًا وَعَدَّدَهُ, tanwīn meets wāw, a letter of the nasalized idghām group. The result is idghām with ghunnah, followed by a properly articulated wāw.
Contrast the lām after tanwīn in waylun li-kulli, which takes no ghunnah. Also distinguish pausing on مَالًا: ordinary fatḥ-tanwīn at a pause is replaced by a madd ʿiwaḍ rather than by connected assimilation.