If the verb’s third letter does not bear an original ḍammah, begin with kasrah. The chapter gives forms including ٱضْرِبْ, ٱفْتَحْ, ٱنْفَجَرَتْ and ٱجْتُثَّتْ.
It explicitly distinguishes an incidental ḍammah from an original one; do not assign initial ḍammah solely because a third-letter ḍammah appears on the page.
Opening interactive controls...
Kasrah and incidental ḍammah
Rules of Hamzah — Taḥqīq, Tashīl, Ibdāl and Hamzat al-Waṣl
If the verb’s third letter does not bear an original ḍammah, begin with kasrah. The chapter gives forms including ٱضْرِبْ, ٱفْتَحْ, ٱنْفَجَرَتْ and ٱجْتُثَّتْ.
It explicitly distinguishes an incidental ḍammah from an original one; do not assign initial ḍammah solely because a third-letter ḍammah appears on the page.