Ramayana
राक्षसानां समुद्योगं तं तु नारायणः प्रभुः । देवदूतादुपश्रुत्य चक्रे युद्धे तदा मनः ॥ 7-6-62 ॥
But the Lord Narayana, having heard from the messenger of the gods of that mustering of the Rakshasas, then set his mind upon battle.
english translation