Explanation

Qiyas (قياس) is the principle of analogical reasoning in Islamic jurisprudence.

It involves using reasoning by analogy to derive a ruling or judgment in a particular case, based on a similar case or principle established in the Quran, Hadith, or previous juristic decisions.

Qiyas is one of the four main sources of Islamic law, alongside:

1. Quran (the holy book of Islam)
2. Hadith (the sayings and actions of the Prophet Muhammad)
3. Ijma (consensus of the Muslim community)
4. Qiyas (analogical reasoning)