The stated condition is that the consonant immediately before and the pronounced consonant after the pronoun hāʾ are both vowelled in connected reading, subject to the book’s listed exceptions.
Inspect the actual sounds on both sides. If either side is sākin, the ordinary ṣilah condition is not met.
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Condition for pronoun ṣilah
Rules of Hāʾ al-Ḍamīr: Vowels, Ṣilah and Exceptions
The stated condition is that the consonant immediately before and the pronounced consonant after the pronoun hāʾ are both vowelled in connected reading, subject to the book’s listed exceptions.
Inspect the actual sounds on both sides. If either side is sākin, the ordinary ṣilah condition is not met.