Nasikh wa Mansukh is the "Science of Abrogation" in the Quran. It deals with the study of which verses (Nasikh) have replaced others (Mansukh) in terms of legal application. While the text of the "Mansukh" verse remains in the Quran and is still recited as an act of worship, its legal command is no longer followed. This science is essential for Faqiha (jurists) to avoid confusion and to ensure that Islamic law is derived from the final and most complete stage of the Prophetic mission. The concept of abrogation (naskh) is mentioned in the Quran: "We do not abrogate a verse or cause it to be forgotten except that We bring forth better than it or similar to it" (2:106). This acknowledges that some verses were replaced by later revelations as the Sharia developed. The wisdom behind abrogation is that the Sharia was revealed gradually. Early rulings were sometimes temporary or suited to specific circumstances; later rulings refined and finalized the law. For example, alcohol was prohibited in stages: first its harm was mentioned, then its prohibition was limited to prayer times, and finally it was completely forbidden. The verses that came later (nasikh) abrogated the earlier ones (mansukh). Abrogation applies only to legal rulings, not to matters of belief or stories. The text of the mansukh verse remains in the Quran and is recited, but its ruling is no longer applied. For instance, the verse that gave a choice to the Prophet's wives (33:28) was abrogated by a later verse that required them to remain. Scholars have identified a small number of abrogated verses, though there is debate about the exact count. The study of Nasikh wa Mansukh is essential for proper legal reasoning. Without it, a jurist might apply a ruling that was later replaced. It ensures that the final, complete Sharia is derived from the Quran. In modern times, some have denied the concept of abrogation, but the majority of scholars affirm it based on the Quran and the practice of the companions. It is a sophisticated tool for understanding the development of Islamic law. Nasikh wa Mansukh teaches that the Sharia was revealed in stages, that God knows what is best for His servants at each stage, and that the final Sharia is complete and perfect. It calls believers to study the Quran with depth, to understand its historical development, and to derive rulings from its final, fully revealed form.