The fourth section again says that when sākin mīm precedes bāʾ, ghunnah is present in its concealed form. That connects the earlier mīm rule to the nasal-sound chapter: neither erase mīm nor treat the sequence as two mīms merged together.
In هُمْ بِمُؤْمِنِينَ, listen for the nasal mīm realization followed by a distinct onset of bāʾ. Written rules alone cannot ensure correct lip and nasal articulation; check with a qualified reciter.
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Ghunnah with mīm before bāʾ
The fourth section again says that when sākin mīm precedes bāʾ, ghunnah is present in its concealed form. That connects the earlier mīm rule to the nasal-sound chapter: neither erase mīm nor treat the sequence as two mīms merged together.
In هُمْ بِمُؤْمِنِينَ, listen for the nasal mīm realization followed by a distinct onset of bāʾ. Written rules alone cannot ensure correct lip and nasal articulation; check with a qualified reciter.