So far we have selected the hāʾ’s vowel—هِ, هُ, or in special words هْ. The next issue is ishbāʿ/ṣilah, extending the pronoun’s kasrah or ḍammah by a corresponding lengthening sound.
The two decisions are independent. A hāʾ with kasrah is not automatically lengthened, nor is every hāʾ with ḍammah.
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Vowel choice versus ṣilah
Rules of Hāʾ al-Ḍamīr: Vowels, Ṣilah and Exceptions
So far we have selected the hāʾ’s vowel—هِ, هُ, or in special words هْ. The next issue is ishbāʿ/ṣilah, extending the pronoun’s kasrah or ḍammah by a corresponding lengthening sound.
The two decisions are independent. A hāʾ with kasrah is not automatically lengthened, nor is every hāʾ with ḍammah.