Irenaeus refers to:
“the only true and life-giving faith, which the Church has received from the apostles and imparted to her sons. For the Lord of all gave to His apostles the power of the Gospel, through whom also we have known the truth, that is, the doctrine of the Son of God; to whom also did the Lord declare: ‘He that heareth you, heareth Me; and he that despiseth you, despiseth Me, and Him that sent Me.’ We have learned from none others the plan of our salvation, than from those through whom the Gospel has come down to us, which they did at one time proclaim in public, and, at a later period, by the will of God, handed down to us in the Scriptures, to be the ground and pillar of our faith.” (Against Heresies, 3, Preface; 3:1:1)