Istifʿāl: Istimdād and Doubling
نوع / بابPastPresentParticipleCommand / lāmProhibition
الاستمداد — معروفاِسْتَمَدَّيَسْتَمِدُّمُسْتَمِدٌّاِسْتَمِدَّلَا تَسْتَمِدَّ
الاستمداد — مجہولاُسْتُمِدَّيُسْتَمَدُّمُسْتَمَدٌّلِيُسْتَمَدَّلَا تُسْتَمَدَّ
اِسْتَمَدَّ → يَسْتَمِدُّ = sought assistance → seeks assistance. مُسْتَمِدٌّ names the seeker, while مُسْتَمَدٌّ is the corresponding passive derivative. Doubling is central.