Acts 7:26
And the next day, he shewed himself to them, as they were quarrelling, and would have persuaded them to peace, saying, Sirs, ye are brethren: why do ye wrong one another?
1 Corinthians 6:5-8
I speak to your shame. What, is there not so much as one wise man among you, that shall be able to judge between his brethren?
Hebrews 13:1
Let brotherly love continue.
1 Peter 3:8
Finally, Be ye all of one mind, sympathizing with each other, love as brethren, be pitiful, be courteous:
1 John 3:11-13
For this is the message which ye heard from the beginning, that we love one another.