Idghām of identical letters involves two instances of the same consonant. The source illustrates it with إِذْ ذَهَبَ: the final sākin dhāl meets another dhāl.
Pronounce the junction as an assimilated sound, not two separated attacks. Yet identical letters are not assimilated in every context—for instance when the first is a long-vowel letter.
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Mithlayn: identical letters
Idghām: Types, Complete/Incomplete Assimilation and the Definite Article
Idghām of identical letters involves two instances of the same consonant. The source illustrates it with إِذْ ذَهَبَ: the final sākin dhāl meets another dhāl.
Pronounce the junction as an assimilated sound, not two separated attacks. Yet identical letters are not assimilated in every context—for instance when the first is a long-vowel letter.