Definition and Context
Unity in righteous indignation refers to the collective response of believers who, motivated by a shared sense of justice and moral outrage, stand together against sin, injustice, or any affront to God's holiness. This concept is rooted in the biblical understanding that there are times when anger is not only justified but necessary to uphold righteousness and truth.

Biblical Foundations
Righteous indignation is seen throughout Scripture as a response to sin and injustice. It is distinct from human anger, which can often be self-centered and destructive. Righteous indignation is God-centered, aiming to restore God's order and justice. The Bible provides numerous examples where unity in such indignation is both demonstrated and encouraged.

Old Testament Examples
In the Old Testament, the prophets often exemplified unity in righteous indignation. For instance, the prophet Amos called for justice and righteousness, condemning the social injustices of his time: "But let justice roll on like a river, and righteousness like an ever-flowing stream" (Amos 5:24). The collective call to repentance and justice was a unifying force among those who sought to align with God's will.

Another example is found in the account of Phinehas, who acted with zeal for God's holiness by stopping a blatant act of immorality among the Israelites (Numbers 25:6-13). His actions were commended by God, and his zeal became a rallying point for the people to return to covenant faithfulness.

New Testament Teachings
In the New Testament, Jesus Himself displayed righteous indignation, most notably when He cleansed the temple of money changers and merchants who had turned a house of prayer into a "den of robbers" (Matthew 21:13). His actions were a call to purity and reverence for God's house, and they unified His followers in understanding the seriousness of maintaining holiness.

The early church also demonstrated unity in righteous indignation. In Acts 5, the account of Ananias and Sapphira shows the community's collective stand against deceit and hypocrisy. The fear of the Lord and the desire for purity unified the believers, leading to a powerful witness to the surrounding community.

Theological Implications
Unity in righteous indignation is not merely about anger but about aligning with God's heart for justice and holiness. It requires discernment to ensure that the indignation is truly righteous and not tainted by personal vendettas or unrighteous motives. Ephesians 4:26-27 advises, "Be angry, yet do not sin. Do not let the sun set upon your anger, and do not give the devil a foothold." This passage underscores the importance of maintaining righteousness even in anger.

Practical Application
For believers today, unity in righteous indignation can manifest in various ways, such as standing against social injustices, advocating for the oppressed, or confronting sin within the church. It calls for a collective commitment to God's standards and a willingness to act in love and truth. The church is encouraged to be a prophetic voice in society, speaking out against evil and working towards justice and reconciliation.

Conclusion
Unity in righteous indignation is a powerful expression of the church's commitment to God's holiness and justice. It requires a balance of truth and love, ensuring that actions taken are in line with God's character and purposes. Through prayer, discernment, and a deep commitment to Scripture, believers can stand together in righteous indignation, reflecting God's heart to a world in need of His justice and mercy.