"The true Christian church, or house of God, is composed of all those in every place that do publicly acknowledge Jesus of Nazareth as the true Messiah, and the only Savior of men; and, building themselves upon the foundation of the Apostles and Prophets, associate under the constitution which he himself has granted and authorized in the New Testament, and are walking in his ordinances and commandments—and of none else"
(Alexander Campbell, The Christian System (2nd ed, 1839), Chapter XXIV: "The Body of Christ").