Ulum al Qur'an
Why it is important
Knowledge of al-nasikh wa al-mansukh is important because it concerns the correct and exact application of the laws of Allah. It is specifically concerned with legal revelations:
It is one of the important pre-conditions for explanation (tafsir) of the Qur'an.
It is one of the important pre-conditions for understanding and application of the Islamic law (hukm, shari'a).
It sheds light on the historical development of the Islamic legal code.
It helps to understand the immediate meaning of the ayat concerned.
Tafsir (explanation of the Qur'an) or legal ruling is not acceptable from a person who does not have such knowledge.