Mahabharata 5.153.18

5.153.18

na tu paśyāmi yoddhāramātmanaḥ sadṛśaṃ bhuvi |
ṛte tasmānnaravyāghrātkuntīputrāddhanaṃjayāt || 18 ||

"Bhishma said, 'O mighty-armed one, it is even so, 'O Bharata, as thou sayest. But the Pandavas are as dear to me as ye yourselves. Therefore, O king, I should certainly seek their good as well, although I shall certainly fight for thee, having given thee a pledge (before) to that effect. I do not see the warrior on earth that is equal to me, except that tiger among men, Dhananjaya, the son of Kunti. Endued with great intelligence, he is conversant with innumerable celestial weapons. That son of Pandu, however, will never fight with me openly. With the power of my weapons, I can, in a trice, destroy this universe consisting of gods, Asuras, Rakshasas, and human beings. The sons of Pandu, however, O king, are incapable of being exterminated by me. I shall, therefore, slay every day ten thousand warriors. If, indeed, they do not slay me in battle first, I will continue to slaughter their forces thus. There is another understanding on which I may willingly become the commander of thy forces. It behoveth thee to listen to that. O lord of earth, either Karna should fight first, or I will fight first. The Suta's son always boasts of his prowess in battle, comparing it with mine.'