While continuing to work as a junior clerk, Sir Syed began focusing on writing, from the age of 23 (in 1840), on various subjects (from mechanics to educational issues), mainly in Urdu, where he wrote, at least, 6000 pages. His career as an author began when he published a series of treatises in Urdu on religious subjects in 1842. He published the book Asaar-us-sanadeed (Great Monuments) documenting antiquities of Delhi dating from the medieval era. This work earned him the reputation of a cultured scholar. In 1842, he completed the Jila-ul-Qulub bi Zikr-il Mahbub and the Tuhfa-i-Hasan, along with the Tahsil fi jar-i-Saqil in 1844. These works focused on religious and cultural subjects. In 1852, he published the two works Namiqa dar bayan masala tasawwur-i-Shaikh and Silsilat ul-Mulk. He released the second edition of Ansar-as-sanadid in 1854. He also started work on a commentary on the Bible – the first by a Muslim – in which he argued that Islam was the closest religion to Christianity, with a Common lineage from Abrahamic religions. He began with Genesis and Matthew, the first books of the Old and New Testament, but quit his project before even completing those first two. His other writings such as Loyal Muhammadans of India, Tabyin-ul-Kalam and A Series of Essays on the Life of Muhammad and Subjects Subsidiary Therein helped to create cordial relations between the British authorities and the Muslim community.