This article, written by Nooruddin, details the life and significance of Ubayy Ibn Ka'b (RA), a prominent figure in early Islam. It highlights his close relationship with Prophet Muhammad (PBUH), emphasizing Ubayy's unparalleled knowledge and mastery of the Quran, to the point that he was recommended as one of the four people to learn the holy book from. The text also illustrates Ubayy's role as a trusted advisor and scholar during the reigns of Caliphs Abu Bakr (RA) and Umar (RA), with whom he sometimes disagreed, showcasing his deep understanding of Islamic law and unwavering commitment to truth and justice. The article culminates with Ubayy's death in Medina, solidifying his legacy as a leading Quran scholar and a guiding light for the Muslim community.