Bhagavatapurana 1.7.40

1.7.40

/0 sūta uvāca
evaṃ parīkṣatā dharmaṃ pārthaḥ kṛṣṇena coditaḥ /
naicchaddhantuṃ gurusutaṃ yadyapyātmahanaṃ mahān //

40. Suta said:—Though he was thus spurred by Sri Krishna who was putting (his sense of) Dharma to test, the great Arjuna did not want to kill the son of his preceptor, the slayer as he was of his own self, *i.e.* his children.