John, chapters 13 through 16 is Jesus’ last discourse with His twelve disciples the evening before He is crucified.  He shared many things with them, His departure; betrayal; Peter’s denial; He answers their questions as to where He is going. He speaks of the coming of the Holy Spirit, the Helper, and of peace.  He speaks of their relationship to Christ, to each other, to the world; and more.  
Jesus closes with,
“These things I have spoken to you, that in Me you may have peace.  In the world you will have tribulation; but be of good cheer, I have overcome the world.”  John 16:33
 
In His discourse He repeats ‘love an another’ five times:
He says in John 13:34-35,
“A new commandment I give to you, that you love one another; as I have loved you; that you love one another.  By this all will know that you are My disciples, if you have love for one another.”
 
Jesus repeats ‘love one another’ in John 15:12,
“This is My commandment, that you love one another as I have loved you.”
And Vs. 17,
“These things that I command you, that you love one another.”
 
In the apostle Paul’s letters, he gives suggestions as to how Believers could obey the command to ‘love one another’ as:
In Romans 15:5-7
“Now may the God of patience and comfort grant you to be like-minded toward one another, according to Christ Jesus,
That you may with one mind and one mouth glorify the God and Father of our Lord Jesus Christ.
Therefore receive one another, just as Christ also received us, to the glory of God.
 
In Galatians 6:2,
“Bear one another’s burdens, and so fulfill the law of Christ.”
 
In Ephesians 5:21
“Be subject to one another in the fear (reverence) of Christ.” 
 
In 1 Thessalonians 5:13,
“ …Live in peace with each other.”
 
The apostle John in 1 John 4:7-11 gives us a wonder explanation of what this ‘love one another’ is about,
“Beloved, let us love one another, for love is of God; and everyone who loves is born of God and knows God.
He who does not love does not know God, for God is love.
In this the love of God was manifested toward us, that God has sent His only begotten Son into the world, that we might live through Him.
In this is love, not that we loved God, but that He loved us and sent His Son to be the propitiation for our sins.
Beloved, if God so loved us, we also ought to love one another.”
 
Love is a command!  It is critical for the world to see.  So let us love for God’s glory, for our relationship to each other and for the world to see.  And in so doing that hearts would be drawn to Jesus and salvation.  
 
Lord God, thank you for your Word, Jesus, who shows us how to love one another.  You are conforming each of us to the image of your Son Jesus, and this is not always easy.  But in all things we give you thanks for the indwelling Holy Spirit who convicts us of wrongdoing and who leads us in the path of righteousness.  Thank you, Lord, and we give all the glory to you!!  Amen