§889
Creed › … › Paragraph 4. Christ's Faithful - Hierarchy, Laity, Consecrated Life
The teaching office
In order to preserve the Church in the purity of the faith handed on by the apostles, Christ who is the Truth willed to confer on her a share in his own infallibility. By a "supernatural sense of faith" the People of God, under the guidance of the Church's living Magisterium, "unfailingly adheres to this faith."
Source: Catechism of the Catholic Church (Vatican.va)