Hebrews 2:11
Both the one who makes men holy and those who are made holy are of the same family. So Jesus is not ashamed to call them brothers.
Hebrews 10:24-25
24And let us consider how we may spur one another on toward love and good deeds.25Let us not give up meeting together, as some are in the habit of doing, but let us encourage one another—and all the more as you see the Day approaching
Romans 12:10
Be devoted to one another in brotherly love. Honor one another above yourselves.