1 John 2:7
My dearly loved ones, I am not writing to you about a new commandment, but about an old one. [It is the one] you had learned about from the beginning. [Note: This is the commandment to love one another (3:1: II John 5) which Jesus had taught his disciples during His earthly ministry. See Mark 12:31]. This old commandment is the word [of God] which you heard [previously].
1 John 3:11
[Now] this is the message that you people heard from the beginning [of Christ's ministry], that we should love one another [See Mark 12:31],
2 John 1:5-6
And now I ask you, lady [See verse 1], not as though writing a new commandment to you, but [I wanted to remind you of] one that we had [heard] from the beginning [of Christ's ministry]: [It is] that we should love one another.
Matthew 5:43
"You have heard what was said [Lev. 19:18], 'You must love your neighbor and hate your enemy.'
Matthew 22:37-40
Jesus replied, [Deut. 6:5] "'You must love the Lord your God with all your heart, with all your soul and with all your mind.'
Mark 12:29-34
And Jesus answered, "The foremost one is this [Deut. 6:4-5], 'Hear this, you Israelites, the Lord our God is the only Lord,
Acts 17:19
So, they led him to the Areopagus [i.e., an elevated assembly place called "the Hill of Mars"] and asked him, "Could we learn [more] about this new teaching you are speaking of?
Romans 13:8-10
Do not owe anything to anyone, except to love one another. For the person who loves others has fulfilled [the requirements of] the law.
Galatians 5:13-14
For you brothers were called [by God] to enjoy your freedom; but do not use this freedom as an excuse for living a sinful life; instead, use it to render loving service to each other.
James 2:8-12
However, you are doing well if you fulfill [i.e., obey] the royal law found in the Scriptures [Lev. 19:18], "You should love your neighbor the same way that you love yourself."
1 John 2:24
You people should continue [to practice] what you heard from the beginning [i.e., to love one another, See verses 7-11]. If you do, then you also will continue in [fellowship with] the Son, and with the Father.
1 John 3:23
And this is His commandment: We should believe in the name of His Son Jesus Christ [i.e., the person of Christ], and love one another, just He has commanded us to do.