Mbh 1.156.3

“Vaisampayana continued, ‘Hearing those words of hers, Yudhishthira suddenly rose up and Arjuna also and Nakula and Sahadeva of great energy and they beheld Bhima and the Rakshasa already engaged in fight, eager to overcome each other and dragging each other with great force, like two lions endued with great might. The dust raised by their feet in consequence of that encounter looked like the smoke of a forest-conflagration. Covered with that dust their huge bodies resembled two tall cliffs enveloped in mist. Then Arjuna, beholding Bhima rather oppressed in the fight by the Rakshasa, slowly, said with smiles on his lips, ‘Fear not, O Bhima of mighty arms! We (had been asleep and therefore) knew not that thou wast engaged with a terrible Rakshasa and tired in fight. Here do I stand to help thee, let me slay the Rakshasa, and let Nakula and Sahadeva protect our mother.’ Hearing him, Bhima said, ‘Look on this encounter, O brother, like a stranger. Fear not for the result. Having come within the reach of my arms, he shall not escape with life.’ Then Arjuna said, ‘What need, O Bhima, for keeping the Rakshasa alive so long? O oppressor of enemies, we are to go hence, and cannot stay here longer. The east is reddening, the morning twilight is about to set in. The Rakshasa became stronger by break of day, therefore, hasten, O Bhima! Play not (with thy victim), but slay the terrible Rakshasa soon. During the two twilights Rakshasas always put forth their powers of deception. Use all the strength of thy arms.