In الْحَمْدُ, the article lām is pronounced because ḥāʾ is a moon letter. Within حَمْدُ, mīm sākinah precedes dāl, so it is iẓhār shafawī, neither assimilation nor concealment.
In لِلَّهِ, the preceding lām with kasrah makes the lām of the Divine Name light. A short phrase thus requires three distinct grammatical-phonetic decisions.
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Al-Ḥamdu lillāh: lām and mīm decisions
Al-Fātiḥah: Integrated Tajwīd, Madd and Pausing Practice
In الْحَمْدُ, the article lām is pronounced because ḥāʾ is a moon letter. Within حَمْدُ, mīm sākinah precedes dāl, so it is iẓhār shafawī, neither assimilation nor concealment.
In لِلَّهِ, the preceding lām with kasrah makes the lām of the Divine Name light. A short phrase thus requires three distinct grammatical-phonetic decisions.