When and how Vedas came to us?

If you see Wikipedia you will see that Vedas were composed 1500 - 1200 BC. Additionally, Wikipedia says "The Vedas have been orally transmitted since the 2nd millennium BCE with the help of elaborate mnemonic techniques."

It additionally says "The oldest part of the Rig Veda Samhita was orally composed in north-western India (Punjab) between c. 1500 and 1200 BC".

These dates are deduced by the researchers based on their research. As they find new evidence these dates keep changing. Given that, anyone can infer that these dates might not be bonafide !

When you are looking for answers on a topic then you seek the advice of the authority of that subject.

Jagadguruttam Swami Shri Kripalu Ji Maharaj is the contemporary greatest authority on the Vedic Scriptures. He was acclaimed as Pad-Vakya-Pramad-Para-Varid by the the assembly of 500 greatest Vedic scholars.

These highly accomplished scholars declared to the world that Shri Maharaj Ji's knowledge was the source of the knowledge in all of the Vedic Scriptures. So, here are Shri Maharaj Ji's words as evidence to answer your question.

Vedas were never created anew.

At the time of Mahapralaya Vedas merge back into Brahm-The Supreme Lord.

Before the creation while Karnarnavshayi Mahavishnu was asleep in Yoganidra the Vedas emerged from His breath. Then Shri Krishna manifests this knowledge in the mind of each Creator Brahma. There is one Brahma for each brahmand.

Our brahmand was created by Chaturmukhi Brahma (Lord Brahma with 4 faces) about 154 trillion years ago. So in this brahmand, Vedas were introduced 154 trillion years ago. 

Lord Brahma gave this knowledge to His sons the sages. It gets transmitted orally in the first 3 yugas of Chaturyuga. Then, in Kaliyug people don't have a vast memory or comprehension power. So, just before Kaliyug, about 5000 years ago (which means approximately 3000 BC) Veda Vyas condensed 1 Billion hymns down to 100,000  hymns of Vedas and divided them into 4 books namely Rig Veda, Yajur Ved, Sam Ved and, Artharva Ved.

​Additionally, sometimes in the middle of the creation, if Vedas ever get lost then God introduces them back again.

That is how Vedas they are reproduced in each brahmand.

In this context you might wonder if God orally transmitted one billions mantra of Vedas?

How were Vedas handed down to us

Speech or vani (Devanagari: वाणी ISO15919: vāṇī) is of various kinds

• Para vani (Devanagari: परा वाणी ISO15919: parā vāṇī)- limited to atma. Orator has no independence.
• Pashyanti vani (Devanagari: पश्यन्ती वाणी ISO15919: paśyantī vāṇī) - words and meanings are in sync. But no relationship with mind. Orator has no independence.
• Madhyama vani (Devanagari: मध्यमा वाणी ISO15919: madhyamā vāṇī) - meaning and words differ in meaning. Related to the mind but no relationship with senses. Orator has independence
• Vaikhari vani (Devanagari: वैखरी वाणी ISO15919: vaikharī vāṇī) - 2 types - orator has full independence
  • Upanshu (Devanagari: उपान्शु वाणी ISO15919: upānśu vāṇī) - very low volume spoken in the ears
  • Uchayih (Devanagari: उच्चयी वाणी ISO15919: uccayī vāṇī) - loudly like while giving a lecture.

Vedas were given by God to rishi using pashyanti vani and madhyama vani.

Those rishis' produced Vedas in vaithari vani. Then about 5000 years ago Ved Vyas produced the same in print.

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