According to search-discovered classical Islamic scholarship, the term **Scum (Ghutha')** is a profound Quranic metaphor primarily detailed in Surah Ar-Ra'd (13:17). Tafsir by authorities like Ibn Kathir explains that Allah presents a dual parable—of rainwater carrying foam and smelted metals producing dross—to illustrate the fundamental difference between truth (al-Haqq) and falsehood (al-Batil). The scum, which is showy and rises to the surface, represents falsehood: it is ephemeral, without substance, and ultimately cast away as useless. In contrast, the pure water and refined metal, which remain on the earth and benefit humanity, represent the enduring and valuable nature of truth. This concept is further illuminated by a famous hadith where the Prophet (ﷺ) described the future weakness of the Muslim Ummah as being like the 'scum of a torrent,' numerous in quantity but lacking in qualitative strength due to worldly attachments. The synthesis of the Quranic parable and the prophetic warning establishes Ghutha' as a critical concept for both epistemological discernment and spiritual self-assessment.