What does the Bible say about brotherly unity?

Psalm 133 beautifully captures the essence of brotherly unity, declaring, 'Behold, how good and how pleasant it is for brethren to dwell together in unity!' This unity is akin to precious anointing oil poured upon Aaron's head, symbolizing the rich blessings that flow from Christ, our great High Priest, to His body, the Church. As believers, our unity is not rooted in mere agreement or social ties; it is grounded in our shared identity in Christ, who has made us one family through adoption. This unity fosters an environment enriched by love, support, and spiritual growth among believers.