Ramayana
लक्ष्मणेन सहायेन प्रयातः केकयेश्वरः । हते ऽसुरे यथा वृत्रे विष्णुना सह वासवः ॥ 7-38-15 ॥
The lord of the Kekayas set out with Lakshmana as his companion, as Vasava (Indra) went forth together with Vishnu when the demon Vritra had been slain.
english translation