देवासुरा ह वै यत्र सयेतिरे उभयेप्राजापत्यास्तद्ध देवा उद्गीथमाजह्रुरनेनै-नानभिभविष्याम इति ॥ १ ॥
In plain words
Once upon a time, the gods and the demons—both offspring of Prajapati—entered into conflict. The gods took up the sacred udgitha chant, resolving, 'With this, we shall overcome them.'
Close to the Sanskrit
The gods and demons, verily, both descendants of Prajapati, strove together on a certain occasion. The gods took up the udgitha, thinking, 'By this we shall overcome these [demons].'