The third Source of Islamic Fiqah is?

The third Source of Islamic Fiqah is?

اسلامی فقہ کا تیسرا ماخذ کیا ہے؟
Explanation
The primary sources of Islamic law are:
  1. The Quran
  2. The Sunnah (traditions of the Prophet Muhammad SAW)
  3. Ijma (consensus among Muslim jurists)
  4. Qiyas (analogy)