Mahabharata 18.3.31

18.3.31

pūrvaṃ parīkṣito hi tvamāsīrdvaitavanaṃ prati |
araṇīsahitasyārthe tacca nistīrṇavānasi || 31 ||

"While, O Kuru king, the chief of the gods was saying so unto Yudhishthira, the deity of Righteousness, in his embodied form, then addressed his own son and said, ‘O king, I am greatly pleased, O thou of great wisdom, with thee, O son, by thy devotion to me, by thy truthfulness of speech, and forgiveness, and self-restraint. This, indeed, is the third test, O king, to which I put thee. Thou art incapable, O son of Pritha, of being swerved from thy nature or reason. Before this, I had examined thee in the Dwaita woods by my questions, when thou hadst come to that lake for recovering a couple of fire sticks. Thou stoodst it well. Assuming the shape of a dog, I examined thee once more, O son, when thy brothers with Draupadi had fallen down. This has been thy third test; thou hast expressed thy wish to stay at Hell for the sake of thy brothers. Thou hast become cleansed, O highly blessed one. Purified of sin, be thou happy.