Where is the Church?

St. Ignatius of Antioch ca. 50-117

See that you all follow the bishop, even as Jesus Christ does the Father, and the presbytery as you would the apostles; and reverence the deacons, as being the institution of God. Let no man do anything connected with the Church without the bishop. Let that be deemed a proper Eucharist, which is [administered] either by the bishop, or by one to whom he has entrusted it. Wherever the bishop shall appear, there let the multitude [of the people] also be; even as, wherever Jesus Christ is, there is the Catholic Church. (Epistle to the Smyrnaeans, 8)

St. Irenaeus of Lyons died ca. 202

For in the Church, it is said, God has set apostles, prophets, teachers, 1 Cor. 12:28 and all the other means through which the Spirit works; of which all those are not partakers who do not join themselves to the Church, but defraud themselves of life through their perverse opinions and infamous behaviour. For where the Church is, there is the Spirit of God; and where the Spirit of God is, there is the Church, and every kind of grace; but the Spirit is truth. (Against Heresies Bk. 3.24.1)