Srimad-Bhagavatam: Canto 10 - Chapter 1 - Verse 14
Sanskrit:
दृष्ट्वार्भकान् कृष्णमुखानघासुर:कंसानुशिष्ट: स बकीबकानुज: ।अयं तु मे सोदरनाशकृत्तयो-र्द्वयोर्ममैनं सबलं हनिष्ये ॥ १४ ॥
ITRANS:
dṛṣṭvārbhakān kṛṣṇa-mukhān aghāsuraḥkaṁsānuśiṣṭaḥ sa bakī-bakānujaḥayaṁ tu me sodara-nāśa-kṛt tayordvayor mamainaṁ sa-balaṁ haniṣye
Translation:
Aghāsura, who had been sent by Kaṁsa, was the younger brother of Pūtanā and Bakāsura. Therefore when he came and saw Kṛṣṇa at the head of all the cowherd boys, he thought, “This Kṛṣṇa has killed my sister and brother, Pūtanā and Bakāsura. Therefore, in order to please them both, I shall kill this Kṛṣṇa, along with His assistants, the other cowherd boys.”