Ramayana
पुरा किल महाबाहो देवासुरसमागमे । वृत्रो नाम महानासीद्दैतेयो लोकसम्मतः ॥ 7-84-4 ॥
"In days of old, O mighty-armed one, at the meeting of the gods and the asuras, there was a great Daitya named Vritra, esteemed throughout the world."
english translation