Tertullian

"And God said, Let there be light, and there was light." Genesis 1:3 Immediately there appears the Word, "that true light, which lights man on his coming into the world," John 1:9 and through Him also came light upon the world. From that moment God willed creation to be effected in the Word, Christ being present and ministering unto Him: and so God created. The Word also Himself assume His own form and glorious garb, His own sound and vocal utterance, when God says, "Let there be light." Genesis 1:3 This is the perfect nativity of the Word, when He proceeds forth from God. [Against Praxeas 7,12]