1 John 2:7

Brethren, I write not a 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:

1 John 3:11

for this is the injunction which ye heard from the beginning, that we should love one another: not as Cain who was of the evil one, and slew his brother;

2 John 1:5-6

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

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 Jesus said unto him, Thou shalt love the Lord thy God with all thy heart, and with all thy soul, and with all thy mind: this is the first and great command.

Mark 12:29-34

And Jesus answered him, The first of all the commandments is, "Hear, O Israel, the Lord our God is the one Lord,

Acts 17:19

And they took and brought him to the Areopagus, and said, May we know what this new doctrine is, of which thou speakest?

Romans 13:8-10

Owe no one any thing, but to love one another; for he that loveth others hath fulfilled the law:

Galatians 5:13-14

For, brethren, ye have been called unto liberty; only abuse not this liberty for an occasion to indulge the flesh, but by mutual love serve one another.

James 2:8-12

If ye fulfil the royal law, according to the scripture, which saith, Thou shalt love thy neighbour as thyself, ye do well.

1 John 2:24

Let that therefore, which ye have heard from the beginning, abide in you: for if that, which ye heard from the beginning, remain in you, ye also will remain in the Son and in the Father.

1 John 3:23

And this is his commandment, that we should believe in the name of his Son Jesus Christ, and love one another, as He hath given us a charge to do.

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 injunction which ye heard from the beginning, that we should love one another: not as Cain who was of the evil one, and slew his brother;
Acts 17:19
And they took and brought him to the Areopagus, and said, May we know what this new doctrine is, of which thou speakest?
2 John 1:5
And now I beseech thee, Lady, not as writing to thee a new commandment, but that which we had from the beginning, that we may love one another.

But

Matthew 5:43
Ye have heard, that it has been said, Thou shalt love thy neighbour, and hate thine enemy:
Matthew 22:37
And Jesus said unto him, Thou shalt love the Lord thy God with all thy heart, and with all thy soul, and with all thy mind: this is the first and great command.
Mark 12:29
And Jesus answered him, The first of all the commandments is, "Hear, O Israel, the Lord our God is the one Lord,
Romans 13:8
Owe no one any thing, but to love one another; for he that loveth others hath fulfilled the law:
Galatians 5:13
For, brethren, ye have been called unto liberty; only abuse not this liberty for an occasion to indulge the flesh, but by mutual love serve one another.
James 2:8
If ye fulfil the royal law, according to the scripture, which saith, 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.