1 Thessalonians 4:9
"But as touching brotherly love ye need not that I write unto you: for ye yourselves are taught of God to love one another."
Cross References (ranked by relevance)
Be kindly affectioned one to another with brotherly love; in honour preferring one another;
Let brotherly love continue.
And above all things have fervent charity among yourselves: for charity shall cover the multitude of sins.
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.
But of the times and the seasons, brethren, ye have no need that I write unto you.
And to godliness brotherly kindness; and to brotherly kindness charity.
This is the covenant that I will make with them after those days, saith the Lord, I will put my laws into their hearts, and in their minds will I write them;
But the Comforter, which is the Holy Ghost, whom the Father will send in my name, he shall teach you all things, and bring all things to your remembrance, whatsoever I have said unto you.
Finally, be ye all of one mind, having compassion one of another, love as brethren, be pitiful, be courteous:
Therefore every one that eateth it shall bear his iniquity, because he hath profaned the hallowed thing of the LORD: and that soul shall be cut off from among his people.
Behold, how good and how pleasant it is for brethren to dwell together in unity!
And the second is like unto it, Thou shalt love thy neighbour as thyself.
And they shall teach no more every man his neighbour, and every man his brother, saying, Know the LORD: for they shall all know me, from the least of them unto the greatest of them, saith the LORD: for I will forgive their iniquity, and I will remember their sin no more.
And forgettest the LORD thy maker, that hath stretched forth the heavens, and laid the foundations of the earth; and hast feared continually every day because of the fury of the oppressor, as if he were ready to destroy? and where is the fury of the oppressor?