BṚHADĀRAṆYAKA UPANISHAD · 1.5.18
पृथिव्यै चैनम् अग्नेश् च दैवी वाग् आविशति ।
सा वै दैवी वाग् यया यद् यद् एव वदति तत् तद् भवति ॥
pṛthivyai cainam agneś ca daivī vāg āviśati ।
sā vai daivī vāg yayā yad yad eva vadati tat tad bhavati ॥
From the earth and from fire, divine speech enters into him. And verily that is divine speech whereby, whatever he says, comes to be.
F. Max Müller · The Upanishads, Sacred Books of the East 15 (1884)