The text excludes two consecutive wāws or yāʾs when the first functions as a long-vowel letter, as in قَالُوا وَهُمْ and فِي يَوْمٍ.
Preserve the first vowel length instead of swallowing it merely because the following written consonant has the same shape. Look at the sound’s function, not only letter identity.
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Do not absorb long-vowel wāw or yāʾ
Idghām: Types, Complete/Incomplete Assimilation and the Definite Article
The text excludes two consecutive wāws or yāʾs when the first functions as a long-vowel letter, as in قَالُوا وَهُمْ and فِي يَوْمٍ.
Preserve the first vowel length instead of swallowing it merely because the following written consonant has the same shape. Look at the sound’s function, not only letter identity.