Brotherly love in the biblical sense is an extension of the natural affection associated with near kin, toward the greater community of fellow believers.
A new commandment I give to you, that you love one another: just as I have loved you, you also are to love one another. | John 13:34
A new commandment I give to you, that you love one another: just as I have loved you, you also are to love one another. By this all people will know that you are my disciples, if you have love for one another. | John 13:34-35
And above all these put on love, which binds everything together in perfect harmony. | Colossians 3:14
And the grace of our Lord overflowed for me with the faith and love that are in Christ Jesus. | 1 Timothy 1:14
Anyone who does not love does not know God, because God is love. | 1 John 4:8
And godliness with brotherly affection, and brotherly affection with love. | 2 Peter 1:7
And may the Lord make you increase and abound in love for one another and for all, as we do for you. | 1 Thessalonians 3:12
And you shall love the Lord your God with all your heart and with all your soul and with all your mind and with all your strength. | Mark 12:30
By this we know that we love the children of God, when we love God and obey his commandments. | 1 John 5:2
Beloved, if God so loved us, we also ought to love one another. | 1 John 4:11
Beloved, do not believe every spirit, but test the spirits to see whether they are from God, for many false prophets have gone out into the world. | 1 John 4:1
Do not love the world or the things in the world. If anyone loves the world, the love of the Father is not in him. | 1 John 2:15
Do not neglect to show hospitality to strangers, for thereby some have entertained angels unawares. | Hebrews 13:2
For we ourselves were once foolish, disobedient, led astray, slaves to various passions and pleasures, passing our days in malice and envy, hated by others and hating one another. | Titus 3:3
For God is not unjust so as to overlook your work and the love that you have shown for his name in serving the saints, as you still do. | Hebrews 6:10
For God gave us a spirit not of fear but of power and love and self-control. | 2 Timothy 1:7
For the love of Christ controls us, because we have concluded this: that one has died for all, therefore all have died. | 2 Corinthians 5:14
For the love of money is a root of all kinds of evils. It is through this craving that some have wandered away from the faith and pierced themselves with many pangs. | 1 Timothy 6:10
Husbands, love your wives, as Christ loved the church and gave himself up for her. | Ephesians 5:25
Having purified your souls by your obedience to the truth for a sincere brotherly love, love one another earnestly from a pure heart. | 1 Peter 1:22
If you really fulfill the royal law according to the Scripture, “You shall love your neighbor as yourself,” you are doing well. | James 2:8
I say this not as a command, but to prove by the earnestness of others that your love also is genuine. | 2 Corinthians 8:8
If I speak in the tongues of men and of angels, but have not love, I am a noisy gong or a clanging cymbal. | 1 Corinthians 13:1
Keep yourselves in the love of God, waiting for the mercy of our Lord Jesus Christ that leads to eternal life. | Jude 1:21
Love does no wrong to a neighbor; therefore love is the fulfilling of the law. | Romans 13:10
Let love be genuine. Abhor what is evil; hold fast to what is good. | Romans 12:9
Now concerning food offered to idols: we know that “all of us possess knowledge.” This “knowledge” puffs up, but love builds up. | 1 Corinthians 8:1
So we have come to know and to believe the love that God has for us. God is love, and whoever abides in love abides in God, and God abides in him. | 1 John 4:16
You have heard that it was said, ‘You shall love your neighbor and hate your enemy. | Matthew 5:43
In short,you cannot call someone brother while hating them. If you do, you can’t claim to love God.