Mahabharata 3.120.22

3.120.22

vāsudeva uvāca |
asaṃśayaṃ mādhava satyametadgṛhṇīma te vākyamadīnasattva |
svābhyāṃ bhujābhyāmajitāṃ tu bhūmiṃ necchetkurūṇāmṛṣabhaḥ kathaṃcit || 22 ||

"Krishna said, 'O scion of the race of Madhu! no doubt what thou sayest is true; we accept thy words, O thou of courage that is never weak! But this bull of the Kuru race (Yudhishthira) would never accept the sovereignty of the earth, unless it were won by the prowess of his own arms. Neither for the sake of pleasure, nor from fear, nor from covetousness, would Yudhishthira ever renounce the rules of the caste; nor would these two heroes, who are mighty, when mounted on a car--Bhima and Arjuna; nor the twin brothers, nor Krishna, the daughter of Drupada. He possessing the appetite of a wolf (Bhima), and the winner of riches (Arjuna), are both unrivalled in fight throughout the world. And why should not this king rule over the entire world when he hath the two sons of Madri to espouse his cause? The high-souled ruler of Panchala together with the Kekaya king, and we also should put forth our united strength, and then would the enemies of Yudhisthira be annihilated.'"