The story
The nāgas are the serpent beings of the underworld, guardians of treasure and of the water under the earth. Śeṣa carries Viṣṇu on his coils; Vāsuki was the rope at the churning of the ocean; Kṛṣṇa danced on the hood of Kāliya and sent him from the Yamunā. Śiva wears one round his neck.
The monsoon floods the burrows and brings the real snakes into the fields and houses, and the festival is the tradition's way of making peace with them: today no one digs, ploughs or cuts, so that nothing underground is hurt.
The Mahābhārata was first recited at King Janamejaya's snake sacrifice, begun in revenge for his father's death by snakebite and stopped by the sage Āstīka on this day; the day is his too.
