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The Rigveda is the oldest of the Vedas. All the other Vedas are based upon it and consist to a large degree of various mantras from it. It consists of about a thousand richas (name of the Rigvedic mantras) of different seers, arranged in suktas having an average of around ten mantras. That the Rig Veda is the oldest book in Sanskrit or any language is widely accepted by the followers of Sanatana Dharma. Its date of composition is not definite and the Vedic time period is a topic of debate among many scholars. As such it is not in the scope of this article.  

The Rigveda is the oldest of the Vedas. All the other Vedas are based upon it and consist to a large degree of various mantras from it. It consists of about a thousand richas (name of the Rigvedic mantras) of different seers, arranged in suktas having an average of around ten mantras. That the Rig Veda is the oldest book in Sanskrit or any language is widely accepted by the followers of Sanatana Dharma. Its date of composition is not definite and the Vedic time period is a topic of debate among many scholars. As such it is not in the scope of this article.