By this shall all men know that ye are my disciples, if ye have love one to another.
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John 13:33-37
Jamieson, Fausset & Brown (1871) (public domain).
By this shall all men know that ye are my disciples--the disciples of Him who laid down His life for those He loved. if ye have love one to another--for My sake, and as one in Me; for to such love men outside the circle of believers know right well they are entire strangers. Alas, how little of it there is even within this circle!
Other Bible passages linked to this one, most cited first.
If a man say, I love God, and hateth his brother, he is a liar: for he that loveth not his brother whom he hath seen, how can he love God whom he hath not seen? And this commandment have we from him, That he who loveth God love his brother also.
He that loveth his brother abideth in the light, and there is none occasion of stumbling in him.
In this the children of God are manifest, and the children of the devil: whosoever doeth not righteousness is not of God, neither he that loveth not his brother. For this is the message that ye heard from the beginning, that we should love one another. Not as Cain, who was of that wicked one, and slew his brother. And wherefore slew he him? Because his own works were evil, and his brother’s righteous.
That they all may be one; as thou, Father, art in me, and I in thee, that they also may be one in us: that the world may believe that thou hast sent me.
But whoso keepeth his word, in him verily is the love of God perfected: hereby know we that we are in him.
And the multitude of them that believed were of one heart and of one soul: neither said any of them that ought of the things which he possessed was his own; but they had all things common. And with great power gave the apostles witness of the resurrection of the Lord Jesus: and great grace was upon them all. Neither was there any among them that lacked: for as many as were possessors of lands or houses sold them, and brought the prices of the things that were sold,
Authorship: the book itself or Christian tradition. Approximate dates, as in Carson and Moo, An Introduction to the New Testament, and Longman and Dillard, An Introduction to the Old Testament.