Vidura learns about Duryodhan's plan - S7.E4

Vidura decides to spy on Karna to know the Kauravas' plans. Later, he learns the truth and decides to inform Bhishma. Kunti and the Pandava brothers reach Varnavat. Purochan lies to them about the palace. Kunti wishes to light a lamp in the palace. But instead of the lamp, the floor catches fire.