I give you a new commandment, that you love one another.  Just as I have loved you, you also should love one another. By this everyone will know that you are my disciples, if you have love for one another.

The Bible (The New Testament) (AD 1st - 2nd C) Christian sacred scripture

John 13:34-45 (NRSV)

Alternate translations:

• NIV: "A new command I give you: Love one another. As I have loved you, so you must love one another. By this all men will know that you are my disciples, if you love one another."
• KJV: "A new commandment I give unto you, That ye love one another; as I have loved you, that ye also love one another.  By this shall all men know that ye are my disciples, if ye have love one to another."
• "A new commandment I give to you, that you love one another; even as I have loved you, that you also love one another. By this all men will know that you are my disciples, if you have love for one another."

See Matthew 22:36-40.