Mark 7:9

Cyprian Epistle XXXIX

The Lord warns us in His Gospel, saying, "Ye reject the commandment of God, that ye may establish your own tradition."[12]

Cyprian Treatise I On the Unity of the Church

These, doubtless, they imitate and follow, who, despising God's tradition, seek after strange doctrines, and bring in teachings of human appointment, whom the Lord rebukes and reproves in His Gospel, saying, "Ye reject the commandment of God, that ye may keep your own tradition."[55]

Cyprian Treatise IV On the Lord's Prayer

For what can be a more spiritual prayer than that which was given to us by Christ, by whom also the Holy Spirit was given to us? What praying to the Father can be more truthful than that which was delivered to us by the Son who is the Truth, out of His own mouth? So that to pray otherwise than He taught is not ignorance alone, but also sin; since He Himself has established, and said, "Ye reject the commandments of God, that ye may keep your own traditions."[5]