Mahabharata 8.66.65

8.66.65

tvaṃ hi kṣatriyadāyādo mahākulavivardhanaḥ |
smṛtvā dharmopadeśaṃ tvaṃ muhūrtaṃ kṣama pāṇḍava || 65 ||

Brave warriors that are observant of the practices of the righteous, never shoot their weapons at persons with dishevelled hair, or at those that have turned their faces from battle, or at a Brahmana, or at him who joins his palms, or at him who yields himself up or beggeth for quarter or at one who has put up his weapon, or at one whose arrows are exhausted, or at one whose armour is displaced, or at one whose weapon has fallen off or been broken! Thou art the bravest of men in the world. Thou art also of righteous behaviour, O son of Pandu! Thou art well-acquainted with the rules of battle. For these reasons, excuse me for a moment, that is, till I extricate my wheel, O Dhananjaya, from the earth. Thyself staying on thy car and myself standing weak and languid on the earth, it behoveth thee not to slay me now. Neither Vasudeva, nor thou, O son of Pandu, inspirest me with the slightest fear. Thou art born in the Kshatriya order. Thou art the perpetuator of a high race. Recollecting the teachings of righteousness, excuse me for a moment, O son of Pandu!"'"