12 distinct Greek words appear in this verse.

• Love
• Obedience and Disobedience

4 passages from patristic writers, Reformers, and church catechisms citing this verse.

• 1Cor 6:6 — But brother goeth to law with brother, and that before the unbelievers.
• 1John 1:5 — This then is the message which we have heard of him, and declare unto you, that God is light, and in him is no darkness at all.
• 1John 1:5 — This then is the message which we have heard of him, and declare unto you, that God is light, and in him is no darkness at all.
• 1John 2:7 — Brethren, I write no new commandment unto you, but an old commandment which ye had from the beginning. The old commandment is the word which ye have heard from the beginning.
• 1John 2:7 — Brethren, I write no new commandment unto you, but an old commandment which ye had from the beginning. The old commandment is the word which ye have heard from the beginning.
• 1John 3:23 — And this is his commandment, That we should believe on the name of his Son Jesus Christ, and love one another, as he gave us commandment.
• 1John 4:7 — Beloved, let us love one another: for love is of God; and every one that loveth is born of God, and knoweth God.
• 1John 4:21 — And this commandment have we from him, That he who loveth God love his brother also.
• 1John 4:21 — And this commandment have we from him, That he who loveth God love his brother also.
• 1Pet 1:22 — Seeing ye have purified your souls in obeying the truth through the Spirit unto unfeigned love of the brethren, see that ye love one another with a pure heart fervently:
• 1Pet 1:22 — Seeing ye have purified your souls in obeying the truth through the Spirit unto unfeigned love of the brethren, see that ye love one another with a pure heart fervently:
• 1Pet 3:8 — Finally, be ye all of one mind, having compassion one of another, love as brethren, be pitiful, be courteous:
• 1Pet 4:8 — And above all things have fervent charity among yourselves: for charity shall cover the multitude of sins.
• 1Thess 3:12 — And the Lord make you to increase and abound in love one toward another, and toward all men, even as we do toward you:
• 1Thess 4:9 — But as touching brotherly love ye need not that I write unto you: for ye yourselves are taught of God to love one another.
• 1Thess 4:9 — But as touching brotherly love ye need not that I write unto you: for ye yourselves are taught of God to love one another.
• 1Tim 1:5 — Now the end of the commandment is charity out of a pure heart, and of a good conscience, and of faith unfeigned:
• 2John 1:5 — And now I beseech thee, lady, not as though I wrote a new commandment unto thee, but that which we had from the beginning, that we love one another.
• 2John 1:5 — And now I beseech thee, lady, not as though I wrote a new commandment unto thee, but that which we had from the beginning, that we love one another.
• Eph 5:2 — And walk in love, as Christ also hath loved us, and hath given himself for us an offering and a sacrifice to God for a sweetsmelling savour.
• Eph 5:2 — And walk in love, as Christ also hath loved us, and hath given himself for us an offering and a sacrifice to God for a sweetsmelling savour.
• Gal 6:2 — Bear ye one another’s burdens, and so fulfil the law of Christ.
• Heb 11:4 — By faith Abel offered unto God a more excellent sacrifice than Cain, by which he obtained witness that he was righteous, God testifying of his gifts: and by it he being dead yet speaketh.
• Isa 59:15 — Yea, truth faileth; and he that departeth from evil maketh himself a prey: and the LORD saw it, and it displeased him that there was no judgment.
• John 13:34 — A new commandment I give unto you, That ye love one another; as I have loved you, that ye also love one another.
• John 13:34 — A new commandment I give unto you, That ye love one another; as I have loved you, that ye also love one another.
• John 15:12 — This is my commandment, That ye love one another, as I have loved you.
• John 15:12 — This is my commandment, That ye love one another, as I have loved you.