In «مِنْ سِجِّيلٍ», sākin nūn precedes sīn, so ikhfāʾ ḥaqīqī applies with nasalization rather than full nūn clarity.
Inside «سِجِّيلٍ», jīm has shaddah, but the jīm does not acquire the special nasalization of doubled nūn or mīm. On pausing at the word's end, final lām becomes sākin after madd yāʾ, creating madd ʿāriḍ. These are three distinct triggers in a single phrase.
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Min sijjīl: hidden nūn and doubled jīm
Al-Fīl and Quraysh: Applied Iẓhār, Ikhfāʾ, Idghām, Madd and Waqf
In «مِنْ سِجِّيلٍ», sākin nūn precedes sīn, so ikhfāʾ ḥaqīqī applies with nasalization rather than full nūn clarity.
Inside «سِجِّيلٍ», jīm has shaddah, but the jīm does not acquire the special nasalization of doubled nūn or mīm. On pausing at the word's end, final lām becomes sākin after madd yāʾ, creating madd ʿāriḍ. These are three distinct triggers in a single phrase.