Devibhagavatapurana 4.11.35

4.11.35

devā ūcuḥ |
bhavadbhiḥ preṣitaḥ kāvyo mantrārthaṃ kuhakena ca |
tapo jñātaṃ hi yuṣmākaṃ tena yudhyāma eva hi ||

The Devas said:-- You sent your good S’ukrâchârya, out of pretence to acquire the Mantras; your asceticism is veiled under a deceitful object. Therefore we will fight with you certainly.