In a phrase such as مِنْ مَالٍ, nūn sākinah before mīm merges into mīm under the preceding chapter. In أَمْ مَنْ, the first consonant is already sākin mīm. Both can produce a doubled mīm with ghunnah, but their underlying rule and starting letter differ.
Identify the original written consonant first—ن or م—and only then apply the relevant section. Similar pronunciation is not proof that two cases have the same classification.
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Do not confuse two kinds of idghām
In a phrase such as مِنْ مَالٍ, nūn sākinah before mīm merges into mīm under the preceding chapter. In أَمْ مَنْ, the first consonant is already sākin mīm. Both can produce a doubled mīm with ghunnah, but their underlying rule and starting letter differ.
Identify the original written consonant first—ن or م—and only then apply the relevant section. Similar pronunciation is not proof that two cases have the same classification.