1 John 2:7

My dearly-loved friends, it is no new command that I am now giving you, but an old command which you have had from the very beginning. By the old command I mean the teaching which you have already received.

1 John 3:11

For this is the Message you have heard from the beginning--that we are to love one another.

2 John 1:5-6

And now, dear lady, I pray you--writing to you, as I do, not a new command, but the one which we have had from the very beginning--let us love one another.

Matthew 5:43

"You have heard that it was said, 'Thou shalt love thy neighbour and hate thine enemy.'

Matthew 22:37-40

"'Thou shalt love the Lord thy God,'" He answered, "'with thy whole heart, thy whole soul, thy whole mind.'

Mark 12:29-34

"The chief Commandment," replied Jesus, "is this: 'Hear, O Israel! The Lord our God is one Lord;

Acts 17:19

Then they took him and brought him up to the Areopagus, asking him, "May we be told what this new teaching of yours is?

Romans 13:8-10

Owe nothing to any one except mutual love; for he who loves his fellow man has satisfied the demands of Law.

Galatians 5:13-14

You however, brethren, were called to freedom. Only do not turn your freedom into an excuse for giving way to your lower natures; but become bondservants to one another in a spirit of love.

James 2:8-12

If, however, you are keeping the Law as supreme, in obedience to the Commandment which says "You are to love your fellow man just as you love yourself," you are acting rightly.

1 John 2:24

As for you, let the teaching which you have received from the very beginning continue in your hearts. If that teaching does continue in your hearts, you also will continue to be in union with the Son and with the Father.

1 John 3:23

And this is His command--that we are to believe in His Son Jesus Christ and love one another, just as He has commanded us 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 Message you have heard from the beginning--that we are to love one another.
Acts 17:19
Then they took him and brought him up to the Areopagus, asking him, "May we be told what this new teaching of yours is?
2 John 1:5
And now, dear lady, I pray you--writing to you, as I do, not a new command, but the one which we have had from the very beginning--let us love one another.

But

Matthew 5:43
"You have heard that it was said, 'Thou shalt love thy neighbour and hate thine enemy.'
Matthew 22:37
"'Thou shalt love the Lord thy God,'" He answered, "'with thy whole heart, thy whole soul, thy whole mind.'
Mark 12:29
"The chief Commandment," replied Jesus, "is this: 'Hear, O Israel! The Lord our God is one Lord;
Romans 13:8
Owe nothing to any one except mutual love; for he who loves his fellow man has satisfied the demands of Law.
Galatians 5:13
You however, brethren, were called to freedom. Only do not turn your freedom into an excuse for giving way to your lower natures; but become bondservants to one another in a spirit of love.
James 2:8
If, however, you are keeping the Law as supreme, in obedience to the Commandment which says "You are to love your fellow man just as you love yourself," you are acting rightly.

General references

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