Rigveda

http://en.wikipedia.org/wiki/Rigveda

The Rigveda (Sanskrit ऋग्वेद ṛgveda, a compound of ṛc "praise, verse"[1] and veda "knowledge") is an ancient Indian collection of Vedic Sanskrit hymns dedicated to the gods. It is counted among the four Hindu canonical sacred texts (shruti) known as the Vedas. Based on philological and linguistic evidences, the Rigveda was composed roughly between 1700–1100 BCE (the early Vedic period) in the Sapta Sindhu region (a land of seven great rivers) which is now believed to be the region around Punjab, putting it among the world's oldest religious texts in continued use, as well as among the oldest texts of any Indo-European language.
There are strong linguistic and cultural similarities between the Rigveda and the early Iranian Avesta, deriving from the Proto-Indo-Iranian times, often associated with the early Andronovo culture of ca. 2000 BC.[2]
Today, this text is revered by Hindus around the world. Its verses are recited at prayers, religious functions and other auspicious occasions.