Valmiki Ramayana Bala Kanda Sarga 75 Shloka 15

सत्यवताम् among truth speaking ones, वर: foremost, पितामह: grandsire, Brahma, देवतानाम् devatas', अभिप्रायम् intention, विज्ञाय having come to know, तयो: for both of them, विरोधम् quarrel, जनयामास instigated.

Foremost among the truthful, Grandsire Brahma come to know the intention of the gods and triggered a conflict between the gods.