Bṛhadāraṇyaka Upaniṣad ("Great Forest Teaching") 1.3.6

1.3.6

atha ha mana ūcustvaṃ na udgāyeti tatheti tebhyo mana udagāyadyo manasi bhogastaṃ devebhya āgāyadyatkalyāṇam̐ saṃkalpayati tadātmane te viduranena vai na udgātrātyeṣyantīti tamabhidrutya pāpmanāvidhyansa yaḥ sa pāpmā yadevedamapratirūpam̐ saṃkalpayati sa eva sa pāpmaivamu khalvetā devatāḥ pāpmabhirupāsṛjannevamenāḥ pāpmanāvidhyan

Then they said to the mind: 'Do thou sing out for us.' 'Yes,' said the mind, and sang. Whatever delight there is in the mind, that he obtained for the Devas by singing; but that he thought well, that was for himself. The Asuras knew: 'Verily, through this singer they will overcome us.' They therefore rushed at the singer, and pierced him with evil. That evil which consists in thinking what is bad, that is that evil.
Thus they overwhelmed these deities with evils, thus they pierced them with evil.