Garudapurana 3.15.25

3.15.25

tato hariḥ kṛṣṇarūpī babhūva devakyāṃ vai vasudevātsa viṣṇuḥ /
kaṃsādīnvai nitarāṃ hantukāmaḥ samyakpātuṃ pāṇḍavāṃścāpi vīndra //

Then Hari took the form of Kṛṣṇa, that Viṣṇu born of Devakī through Vasudeva, / desiring utterly to slay Kaṃsa and others, and thoroughly to protect the Pāṇḍavas, O King of Birds.