The Fish Warns Manu of the Coming Deluge
After being placed in the ocean, the enormous fish smiles and speaks to Manu with a warning: the destruction of all beings is near. It instructs him to build a strong boat, board it with the saptarshis and all seeds, and wait for the fish to come with a horn to guide them through the flood.
When the fish was thrown into the ocean by Manu, it seemed to smile and uttered these words:
"O lord! You have always protected me with great care. Now hear from me about the task you should perform when the time is right. The destruction of everything on this earth — mobile and immobile — is near. The time for purging this world has arrived. Listen to what will bring your greatest welfare.
"The fear of destruction is nigh for everything that moves, stands, stirs, and does not stir. That terrible time has arrived. You must build a strong and sturdy boat and tether a rope to it. Ascend it with the saptarshis. Take with you all the seeds I have mentioned to you earlier. Ascend on the boat and preserve them separately.
"Wait for me on the boat. I will come to you, and you will know me from my horn. I will now depart. Act according to my instructions. Do not be anxious."
Manu replied: "I will act accordingly."
They took leave of each other and went where they wished. Aranyaka Parva, Chapter 482