1 John 2:5-6 New American Bible (Revised Edition) (NABRE)
5 But whoever keeps his word, the love of God is truly perfected in him. This is the way we may know that we are in union with him: 6 whoever claims to abide in him ought to live [just] as he lived.
The New Commandment.
New American Bible (Revised Edition) (NABRE)
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1 John 2:5-6 New International Version (NIV)
5 But if anyone obeys his word, love for God is truly made complete in them. This is how we know we are in him: 6 Whoever claims to live in him must live as Jesus did.