Bhagavatapurana 1.7.14

1.7.14

bhartuḥ priyaṃ drauṇiriti sma paśyan kṛṣṇāsutānāṃ svapatāṃ śirāṃsi /
upāharadvipriyam eva tasya jugupsitaṃ karma vigarhayanti //

14. The son of Drona, thinking that it would be agreeable to his master, cut off the heads of the sleeping sons of Draupadi and presented them to him,—an act which was, indeed, against his own (his master's) interests and in itself most detestable; (and as such) they (right-minded men) condemn it.