“Gateway to knowledge” was the title of

The correct answer is Ali al Murtaza (R.A). He is famously known as the 'Gateway to Knowledge' (or 'Gate of the City of Knowledge'), a title bestowed upon him by Prophet Muhammad (PBUH) himself, who stated, 'I am the city of knowledge and Ali is its gate.' This profound statement underscores Ali's unparalleled wisdom, deep understanding of Islamic sciences, and his role as a primary source of religious jurisprudence and interpretation for the early Muslim community. His intellectual prowess and comprehensive grasp of the Quran and Sunnah made him an indispensable guide for seekers of knowledge. In contrast, Abu Bakr Siddique (R.A) was known as 'As-Siddiq' (The Truthful), Umar Farooq (R.A) as 'Al-Farooq' (The Discerner), and Usman ibn Affan (R.A) as 'Dhul-Nurayn' (Possessor of Two Lights). These titles reflect their unique contributions and characteristics, but none are associated with being the 'Gateway to Knowledge' like Ali (R.A).