The Yaksha asked, ‘What is it that maketh the Sun rise? Who keeps him company? Who causeth him to set? And in whom is he established?’ Yudhishthira answered, ‘Brahma maketh the Sun rise: the gods keep him company: Dharma causeth him to set: and he is established in truth.’

In plain words: A Yaksha (a nature spirit) tests Yudhishthira with riddles. Asked what makes the Sun rise and set, Yudhishthira says Brahma (the creator god) makes it rise, the gods go with it, Dharma (the law of right order) makes it set, and the Sun rests on truth.