The Epistles of Ignatius

Wherefore it is fitting that ye should run together in accordance with the will of your bishop, which thing also ye do. For your justly renowned presbytery, worthy of God, is fitted as exactly to the bishop as the strings are to the harp. Therefore in your concord and harmonious love, Jesus Christ is sung. And do ye, man by man, become a choir, that being harmonious in love, and taking up the song of God in unison, ye may with one voice sing to the Father through Jesus Christ, so that He may both hear you, and perceive by your works that ye are indeed the members of His Son. It is profitable, therefore, that you should live in an unblameable unity, that thus ye may always enjoy communion with God.