1 John 2:6

Tertullian On Monogamy

When, however, he turns their minds back to continence, ("But I will you all so to be,") "I think, moreover," he says, "I too have the Spirit of God; "in order that, if he had granted any indulgence out of necessity, that, by the Holy Spirit's authority, he might recall. But John, too, when advising us that "we ought so to walk as the Lord withal did,"[15]

Origen de Principiis Book IV

according to the words of Scripture: "He that saith that he believeth in Christ, ought so to walk, as He also walked."[42]

Cyprian Epistle LV

For this is to wish to be found with Christ, to imitate that which Christ both taught and did, according to the Apostle John, who said, "He that saith he abideth in Christ, ought himself also so to walk even as He walked."[5]

Cyprian Treatise II On the Dress of Virgins

It is written, and it is read and heard, and is celebrated for our example by the Church's mouth, "He that saith he abideth in Christ. ought himself also so to walk even as He walked."[23]

Cyprian Treatise IX On the Advantage of Patience

But if we also, beloved brethren, are in Christ; if we put Him on, if He is the way of our salvation, who follow Christ in the footsteps of salvation, let us walk by the example of Christ, as the Apostle John instructs us, saying, "He who saith he abideth in Christ, ought himself also to walk even as He walked."[20]

Cyprian Treatise XII Three Books of Testimonies Against the Jews

Of this same thing in the Epistle of John: "He who saith he abideth in Christ, ought himself also to walk even as He walked."[451]