For a verb beginning with waṣl, an original ḍammah on the third letter requires beginning the waṣl with ḍammah. In ٱنْصُرْ, the third-letter vowel is an example of the relevant pattern.
Count the initial alif when locating the third letter. A visible ḍammah is not enough; the distinction between original and incidental matters.
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Verbs with an original ḍammah
Rules of Hamzah — Taḥqīq, Tashīl, Ibdāl and Hamzat al-Waṣl
For a verb beginning with waṣl, an original ḍammah on the third letter requires beginning the waṣl with ḍammah. In ٱنْصُرْ, the third-letter vowel is an example of the relevant pattern.
Count the initial alif when locating the third letter. A visible ḍammah is not enough; the distinction between original and incidental matters.