Mahabharata Santi Parva Chapter 219:5

Mahabharata Santi Parva (Mokshadharma Parva) Chapter 219:5 As the Ruru casting off its old horns or the snake casting off its slough goes on without attracting any notice, after the same manner a person that is unattached casts off all his sorrows. As a bird deserts a tree that is about to fall down upon a piece of water and thus severing itself from it alights on a (new) resting place, after the same manner the person freed from attachments casts off both joy and sorrow and dissociated even from his subtile and subtiler forms attains to that end which is fraught with the highest prosperity. Their own ancestor Janaka, the chief of Mithila, beholding his city burning in a conflagration, himself proclaimed, "In this conflagration nothing of mine is burning."' King Janadeva, having listened to these words capable of yielding immortality and uttered by Panchasikha, and arriving at the truth after carefully reflecting upon everything that the latter had said, cast off his sorrows and lived on in the enjoyment of great felicity. He who reads this discourse, O king, that treat of emancipation and who always reflects upon it, is never pained by any calamity, and freed from sorrow, attains to emancipation like Janadeva, the ruler of Mithila after his meeting with Panchasikha.