Hinduism is a vast religion and has various texts that they view as sacred. The Vedas are very important religious scriptures. Amongst the Vedas, Rigveda is considered to be composed between 1300-1500 BCE and is considered to be world's oldest scriptures. Bhagavad-Gita is considered to be the most important religious book.
Buddhism in due course established Universities at Nalanda, Vikramashila and Taxila in which many monks and chiefs studied. A large number of Buddhist literatures have cropped up as a result of these Universities. Many of these Buddhist writings are found in Tibetan texts, Chinese translations, and even in distant Northwest countries.
Christian Bible is compiled of various books written by followers of Jesus. These collections of books are also known as 'New Testaments'. The Bible holds all teachings of Jesus on how all Christians should live out their lives.
The oldest Parsi scripture is known as Gatha. Because it was later written in Zend (Commentary) and Ayesta (the language it was written in), it came to be known as Zendavesta.
The Quran contains the spoken words of Allah. The Quran is revealed in Arabic language and is known for its inimitable excellent language. It has 114 chapters that are not chronologically arranged. The different pronouncements by the Prophet at different intervals were recorded and arranged in their present form by orders of Caliph Uthman (645-656). It is worthy of note that the prophet was not a man of letters. Therefore, the utterances in the Quran are considered to be genuine speech of God himself.
Kitab-i-Iqan was written partly in Persian and partly in Arabic by Bahá'u'lláh, the prophet founder of the Bahá'í Faith in 1862. At this time Bahá'u'lláh was living as an exile in Baghdad which at that time was a part of Ottoman Empire.