Bede the Venerable

(ubi sup.) But as John might be called an angel, because he went before the face of the Lord by his preaching, so he might also be rightly called a voice, because, by his sound, he preceded the Word of the Lord. Wherefore there follows, The voice of one crying, &c. For it is an acknowledged thing that the Only-Begotten Son is called the Word of the Father, and even we, from having uttered words ourselves, know that the voice sounds first, in order that the word may afterwards be heard.