Spirit-minded believers are to be ekhad — one — with each other and with God. Believers must agape love each other, in other words, to esteem others the way Yeshua did us — selflessly. Apostle Paul advised believers to avoid division and strife in the “body” of Christ. Those who cause divisions are “worldly-minded, devoid of the Spirit.”
The descendants of Israel, North and South, inherited the covenant of Abraham, Isaac and Jacob at Mt. Sinai hundreds of years before. Yet, instead of living in that covenant, the children of Israel preferred to imitate the practices of the nations around and actually surpassed the surrounding nations around in their iniquity. This is why God judges the entire family of Israel much more severely than He punishes the other nations. This is the prophet’s warning in Amos 3.
Amid the seemingly disconnected warnings about various nations in Amos 1 is a message for the people of God: The answer to social injustice is not socialism but spiritual revival that brings personal transformation. This is also the message of Revelation 1-3.