In «بِحِجَارَةٍ مِنْ», tanwīn meets mīm, producing idghām with ghunnah during connection. Pronouncing a fully separate tanwīn nūn and then a mīm would miss the assimilation.
The first word ends in tāʾ marbūṭah. When stopping on this word, the tanwīn is not read and the ending becomes a sākin hāʾ; there is then no cross-word idghām. Practise connecting, then pausing, to hear both changes.
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Bi-ḥijār(a)tin min: nasalized tanwīn assimilation
Al-Fīl and Quraysh: Applied Iẓhār, Ikhfāʾ, Idghām, Madd and Waqf
In «بِحِجَارَةٍ مِنْ», tanwīn meets mīm, producing idghām with ghunnah during connection. Pronouncing a fully separate tanwīn nūn and then a mīm would miss the assimilation.
The first word ends in tāʾ marbūṭah. When stopping on this word, the tanwīn is not read and the ending becomes a sākin hāʾ; there is then no cross-word idghām. Practise connecting, then pausing, to hear both changes.