According to the unanimous consensus of classical Islamic scholarship, Zina (الزنا) refers to any unlawful sexual intercourse outside the legitimate bond of marriage. The Quran decisively prohibits this act, as stated in Surah Al-Isra (17:32), 'And do not even approach Zina. Indeed, it is a Fahishah (a shameful, outrageous act) and an evil way.' Tafsir scholars like Ibn Kathir explain that the prohibition extends not only to the act itself but to all precursors that lead to it. Jurists such as Al-Qurtubi detail its classification as a major sin (Kabirah) and a violation of God's sacred limits (Hudud), with prescribed punishments designed to protect societal honor, preserve lineage, and deter moral corruption. The synthesis of Quranic verses and prophetic traditions establishes Zina as a grave offense against God, the self, and the community, with a legal framework that, while severe in punishment, sets an almost impossibly high standard of proof to safeguard honor and prevent slander.