In the forest that is known as naimisharanya, Shounaka and the other rishis (sages) were performing a yajna (sacrifice) dedicated to the Lord Vishnu. Suta had also come there, on his way to a pilgrimage.
The sages told Suta, “We have welcomed you. Now describe to us that which makes men all-knowing. Describe to us that which is the most sacred in the whole world”.
Suta replied, “Vishnu is the essence of everything. I went to a hermitage named Vadrika with Shuka, Paila and other sages and met Vyaadeva there. Vyasadeva described to me that which he had learnt from the great sage Vashishtha, Vashishtha having learnt it from the god Agni himself. The Agni Purana is sacred because it tells us about the essence of the brahman (the divine essence). I learnt all this from Vyasadeva and I will now tell you all that I have learnt.”