The Great Epic of the Bhārata dynasty 7.167.44

7.167.44

dhṛtarāṣṭreṇa bhīṣmāya droṇāya ca viśāṃ pate |
visṛṣṭā pṛthivī sarvā saha putraiśca tatparaiḥ || 44 ||

Although I cried repeatedly at the top of my voice for saving the preceptor's life, yet, disregarding my cries and abandoning mortality, a disciple took the life of that preceptor. All of us have passed the greater part of our lives. The days that remain to us are limited. This exceedingly unrighteous act that we have perpetrated has stained that remnant. In consequence of the affection he bore to us, he was a sire unto us. According to the dictates of the scriptures also, he was a sire unto us. Yet he, that preceptor of ours, has been slain by us for the sake of short-lived sovereignty. Dhritarashtra, O king, had given unto Bhishma and Drona the whole earth, and what was still more valuable, all his children. Though honoured by our foe thus, and though he had obtained such wealth from him, the preceptor still loved us as his own children. Of unfading energy and prowess, the preceptor has been slain, only because, induced by thy words he had laid aside his weapons. While engaged in fight he was incapable of being slain by Indra himself. The preceptor was venerable in years and always devoted to our welfare. Yet unrighteous that we are, and stained with a levity of behaviour, we scrupled not to injure him. Alas, exceedingly cruel and very heinous has been the sin that we have committed, for, moved by the desire of enjoying the pleasures of sovereignty, we have slain that Drona.