The Church - instituted by Christ Jesus
The Lord Jesus endowed his community with a structure that will remain until the Kingdom is fully achieved. Before all else there is the choice of the Twelve with Peter as their head. Representing the twelve tribes of Israel, they are the foundation stones of the new Jerusalem. The Twelve and the other disciples share in Christ's mission and his power, but also in his lot. By all his actions, Christ prepares and builds his Church.
Source: Catechism of the Catholic Church (Vatican.va)