If the first sākin in a ghayr-ḥaddih meeting is a madd letter, the source says that its madd sound is dropped in connected recitation. This prevents the impermissible pairing.
Important: this describes pronunciation during liaison, not deleting letters from the written Qurʾān. A stop changes the phonetic situation and the same joining rule may no longer apply.
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When the first sākin is madd: omission
Meeting of Two Sākin Letters — ʿAlā Ḥaddih, Ghayr Ḥaddih and Tanwīn
If the first sākin in a ghayr-ḥaddih meeting is a madd letter, the source says that its madd sound is dropped in connected recitation. This prevents the impermissible pairing.
Important: this describes pronunciation during liaison, not deleting letters from the written Qurʾān. A stop changes the phonetic situation and the same joining rule may no longer apply.