Mīm sākinah has a separate three-way classification:
Mīm before mīm: shafawī idghām with ghunnah, e.g. أَمْ مَنْ.
Mīm before bāʾ: shafawī ikhfāʾ, e.g. هُمْ بِمُؤْمِنِينَ.
Mīm before other letters: shafawī iẓhār, e.g. عَلَيْهِمْ وَلَا and كَيْدَهُمْ فِي.
Before wāw and fāʾ, do not confuse closeness of articulation with a licence to hide mīm. Keep the mīm sound and any required ghunnah in their correct places.
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Three decisions for mīm sākinah
Comprehensive Revision — Applying Tajwīd Rules
Mīm sākinah has a separate three-way classification:
Mīm before mīm: shafawī idghām with ghunnah, e.g. أَمْ مَنْ.
Mīm before bāʾ: shafawī ikhfāʾ, e.g. هُمْ بِمُؤْمِنِينَ.
Mīm before other letters: shafawī iẓhār, e.g. عَلَيْهِمْ وَلَا and كَيْدَهُمْ فِي.
Before wāw and fāʾ, do not confuse closeness of articulation with a licence to hide mīm. Keep the mīm sound and any required ghunnah in their correct places.