Definition and Overview:
Internal strife among believers refers to conflicts, disagreements, and divisions that occur within the Christian community. These disputes can arise from doctrinal differences, personal grievances, leadership struggles, or cultural and social issues. The New Testament addresses such conflicts, emphasizing the importance of unity, love, and reconciliation among believers.

Biblical Instances and Teachings:

1. The Church at Corinth:
The Apostle Paul addresses internal strife in the Corinthian church, where divisions had arisen over allegiance to different leaders. Paul writes, "I appeal to you, brothers, in the name of our Lord Jesus Christ, that all of you agree together, so that there may be no divisions among you and that you may be united in mind and conviction" (1 Corinthians 1:10). He emphasizes that Christ is not divided and that believers should focus on their unity in Him.

2. Dispute Between Euodia and Syntyche:
In Philippians 4:2-3, Paul urges two women, Euodia and Syntyche, to reconcile their differences: "I urge Euodia and Syntyche to agree in the Lord. Yes, and I ask you, my true yokefellow, to help these women who have labored with me for the gospel, along with Clement and the rest of my fellow workers, whose names are in the book of life" . This passage highlights the need for mediation and support from the community to resolve conflicts.

3. James on Quarrels and Conflicts:
The Epistle of James addresses the root causes of strife among believers, pointing to selfish desires and worldly influences. James writes, "What causes conflicts and quarrels among you? Don’t they come from the passions at war within you?" (James 4:1). He calls believers to submit to God, resist the devil, and purify their hearts to overcome internal strife.

4. The Jerusalem Council:
Acts 15 describes the Jerusalem Council, where early church leaders addressed a significant doctrinal dispute regarding the necessity of circumcision for Gentile converts. The resolution of this conflict through discussion, prayer, and the guidance of the Holy Spirit serves as a model for handling doctrinal disagreements within the church.

Principles for Addressing Internal Strife:

1. Pursuit of Unity:
Believers are called to maintain the unity of the Spirit through the bond of peace (Ephesians 4:3). Unity is not uniformity but a harmonious relationship grounded in shared faith and love for Christ.

2. Love and Forgiveness:
Love is the foundation for resolving conflicts. Paul writes, "Bear with one another and forgive any complaint you may have against someone else. Forgive as the Lord forgave you" (Colossians 3:13). Forgiveness and love are essential for healing and reconciliation.

3. Humility and Servanthood:
Jesus taught His disciples to serve one another in humility, as seen in His washing of the disciples' feet (John 13:14-15). Humility allows believers to prioritize others' needs and seek peace over personal agendas.

4. Prayer and Spiritual Discernment:
Prayer is vital in seeking God's wisdom and guidance in resolving conflicts. Believers are encouraged to pray for one another and seek the Holy Spirit's discernment in addressing issues (Philippians 4:6-7).

5. Church Discipline and Restoration:
When conflicts involve sin or persistent division, church discipline may be necessary. Matthew 18:15-17 outlines a process for addressing sin within the community, aiming for repentance and restoration.

Conclusion:
Internal strife among believers is a challenge that the early church faced and continues to be relevant today. The New Testament provides guidance on addressing these conflicts through love, unity, and reliance on God's wisdom. By following biblical principles, believers can work towards reconciliation and maintain the integrity of the Christian witness.