Iftiʿāl: Ittiqād and Ihtidāʾ
نوع / بابPastPresentParticipleCommand / lāmProhibition
الاتقاداِتَّقَدَيَتَّقِدُمُتَّقِدٌاِتَّقِدْلَا تَتَّقِدْ
الاهتداءاِهْتَدَىيَهْتَدِيمُهْتَدٍاِهْتَدِلَا تَهْتَدِ
اِتَّقَدَ → يَتَّقِدُ = ignited → ignites; اِهْتَدَى → يَهْتَدِي = found guidance → finds guidance. Doubling and final-weak changes must be distinguished.