1 John 2:7

Beloved, I write no new commandment to you, but an old commandment, which ye have had from the beginning. The old commandment is the word which ye heard.

1 John 3:11

For this is the message which ye have heard from the beginning, that we should love one another:

Leviticus 19:18

Thou shalt not avenge thyself, nor bear any grudge against the children of thy people, but thou shalt love thy neighbour as thyself: I am Jehovah.

2 John 1:5-6

And now I beseech thee, lady, not as writing to thee a new commandment, but that which we have had from the beginning, that we should love one another.

Leviticus 19:34

As one born among you shall the stranger who sojourneth with you be unto you; and thou shalt love him as thyself; for ye were strangers in the land of Egypt: I am Jehovah your God.

Deuteronomy 6:5

and thou shalt love Jehovah thy God with all thy heart, and with all thy soul, and with all thy strength.

Matthew 5:43

Ye have heard that it has been said, Thou shalt love thy neighbour and hate thine enemy.

Matthew 22:37-40

And he said to him, Thou shalt love the Lord thy God with all thy heart, and with all thy soul, and with all thy understanding.

Mark 12:29-34

And Jesus answered him, The first commandment of all is, Hear, Israel: the Lord our God is one Lord;

Acts 17:19

And having taken hold on him they brought him to Areopagus, saying, Might we know what this new doctrine which is spoken by thee is?

Romans 13:8-10

Owe no one anything, unless to love one another: for he that loves another has fulfilled the law.

Galatians 5:13-14

For ye have been called to liberty, brethren; only do not turn liberty into an opportunity to the flesh, but by love serve one another.

James 2:8-12

If indeed ye keep the royal law according to the scripture, Thou shalt love thy neighbour as thyself, ye do well.

1 John 2:24

As for you let that which ye have heard from the beginning abide in you: if what ye have heard from the beginning abides in you, ye also shall abide in the Son and in the Father.

1 John 3:23

And this is his commandment, that we believe on the name of his Son Jesus Christ, and that we love one another, even as he has given us commandment.

Treasury of Scripture Knowledge

Summary

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.

General references

Bible References

I write

1 John 3:11
For this is the message which ye have heard from the beginning, that we should love one another:
Acts 17:19
And having taken hold on him they brought him to Areopagus, saying, Might we know what this new doctrine which is spoken by thee is?
2 John 1:5
And now I beseech thee, lady, not as writing to thee a new commandment, but that which we have had from the beginning, that we should love one another.

But

Leviticus 19:18
Thou shalt not avenge thyself, nor bear any grudge against the children of thy people, but thou shalt love thy neighbour as thyself: I am Jehovah.
Deuteronomy 6:5
and thou shalt love Jehovah thy God with all thy heart, and with all thy soul, and with all thy strength.
Matthew 5:43
Ye have heard that it has been said, Thou shalt love thy neighbour and hate thine enemy.
Matthew 22:37
And he said to him, Thou shalt love the Lord thy God with all thy heart, and with all thy soul, and with all thy understanding.
Mark 12:29
And Jesus answered him, The first commandment of all is, Hear, Israel: the Lord our God is one Lord;
Romans 13:8
Owe no one anything, unless to love one another: for he that loves another has fulfilled the law.
Galatians 5:13
For ye have been called to liberty, brethren; only do not turn liberty into an opportunity to the flesh, but by love serve one another.
James 2:8
If indeed ye keep the royal law according to the scripture, Thou shalt love thy neighbour as thyself, ye do well.

General references

John 15:12
This is my commandment, that ye love one another, as I have loved you.