1 John 2:7

Beloved, I am not writing a new commandment to you, but an old commandment which you have had from the beginning; the old commandment is the message which you have heard [before from us].

1 John 3:11

For this is the message which you [believers] have heard from the beginning [of your relationship with Christ], that we should [unselfishly] love and seek the best for one another;

Leviticus 19:18

You shall not take revenge nor bear any grudge against the sons of your people, but you shall love your neighbor (acquaintance, associate, companion) as yourself; I am the Lord.

2 John 1:5-6

Now I ask you, lady, not as if I were writing to you a new commandment, but [simply reminding you of] the one which we have had from the beginning, that we love and unselfishly seek the best for one another.

Leviticus 19:34

But the stranger who resides with you shall be to you like someone native-born among you; and you shall love him as yourself, for you were strangers in the land of Egypt; I am the Lord your God.

Deuteronomy 6:5

You shall love the Lord your God with all your heart and mind and with all your soul and with all your strength [your entire being].

Matthew 5:43

“You have heard that it was said, ‘You shall love your neighbor (fellow man) and hate your enemy.’

Matthew 22:37-40

And Jesus replied to him, “‘You shall love the Lord your God with all your heart, and with all your soul, and with all your mind.’

Mark 12:29-34

Jesus answered, “The first and most important one is: ‘Hear, O Israel, the Lord our God is one Lord;

Acts 17:19

They took him and brought him to the Areopagus (Hill of Ares, the Greek god of war), saying, “May we know what this [strange] new teaching is which you are proclaiming?

Romans 13:8-10

Owe nothing to anyone except to love and seek the best for one another; for he who [unselfishly] loves his neighbor has fulfilled the [essence of the] law [relating to one’s fellowman].

Galatians 5:13-14

For you, my brothers, were called to freedom; only do not let your freedom become an opportunity for the sinful nature (worldliness, selfishness), but through love serve and seek the best for one another.

James 2:8-12

If, however, you are [really] fulfilling the royal law according to the Scripture, “You shall love your neighbor as yourself [that is, if you have an unselfish concern for others and do things for their benefit]” you are doing well.

1 John 2:24

As for you, let that remain in you [keeping in your hearts that message of salvation] which you heard from the beginning. If what you heard from the beginning remains in you, you too will remain in the Son and in the Father [forever].

1 John 3:23

This is His commandment, that we believe [with personal faith and confident trust] in the name of His Son Jesus Christ, and [that we unselfishly] love and seek the best for one another, just as He commanded us.

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 you [believers] have heard from the beginning [of your relationship with Christ], that we should [unselfishly] love and seek the best for one another;
Acts 17:19
They took him and brought him to the Areopagus (Hill of Ares, the Greek god of war), saying, “May we know what this [strange] new teaching is which you are proclaiming?
2 John 1:5
Now I ask you, lady, not as if I were writing to you a new commandment, but [simply reminding you of] the one which we have had from the beginning, that we love and unselfishly seek the best for one another.

But

Leviticus 19:18
You shall not take revenge nor bear any grudge against the sons of your people, but you shall love your neighbor (acquaintance, associate, companion) as yourself; I am the Lord.
Deuteronomy 6:5
You shall love the Lord your God with all your heart and mind and with all your soul and with all your strength [your entire being].
Matthew 5:43
“You have heard that it was said, ‘You shall love your neighbor (fellow man) and hate your enemy.’
Matthew 22:37
And Jesus replied to him, “‘You shall love the Lord your God with all your heart, and with all your soul, and with all your mind.’
Mark 12:29
Jesus answered, “The first and most important one is: ‘Hear, O Israel, the Lord our God is one Lord;
Romans 13:8
Owe nothing to anyone except to love and seek the best for one another; for he who [unselfishly] loves his neighbor has fulfilled the [essence of the] law [relating to one’s fellowman].
Galatians 5:13
For you, my brothers, were called to freedom; only do not let your freedom become an opportunity for the sinful nature (worldliness, selfishness), but through love serve and seek the best for one another.
James 2:8
If, however, you are [really] fulfilling the royal law according to the Scripture, “You shall love your neighbor as yourself [that is, if you have an unselfish concern for others and do things for their benefit]” you are doing well.

General references

John 15:12
“This is My commandment, that you love and unselfishly seek the best for one another, just as I have loved you.