Koinonia is a Greek word that occurs 20 times in the Bible. Koinonia’s primary meaning is “fellowship, sharing in common, communion.” The first occurrence of koinonia is Acts 2:42, “They devoted themselves to the apostles' teaching and to the fellowship, to the breaking of bread and to prayer.” Christian fellowship is a key aspect of the Christian life. Believers in Christ are to come together in love, faith, and encouragement. That is the essence of koinonia.
Philippians 2:1-2 declares, “If you have any encouragement from being united with Christ, if any comfort from his love, if any fellowship with the Spirit, if any tenderness and compassion, then make my joy complete by being like-minded, having the same love, being one in spirit and purpose.” Koinonia is being in agreement with one another, being united in purpose, and serving alongside each other. Our koinonia with each other is based on our common koinonia with Jesus Christ. First John 1:6-7 says, “If we say that we have fellowship with Him, and walk in darkness, we lie and do not practice the truth. But if we walk in the light as He is in the light, we have fellowship with one another, and the blood of Jesus Christ His Son cleanses us from all sin.”
A powerful example of what koinonia should look like can be found in a study of the phrase “one another” in the Bible. Scripture commands us to be devoted to one another (Romans 12:10), honor one another (Romans 12:10), live in harmony with one another (Romans 12:16; 1 Peter 3:8), accept one another (Romans 15:7), serve one another in love (Galatians 5:13), be kind and compassionate to one another (Ephesians 4:32), admonish one another (Colossians 3:16), encourage one another (1 Thessalonians 5:11; Hebrews 3:13), spur one another on toward love and good deeds (Hebrews 10:24), offer hospitality (1 Peter 4:9), and love one another (1 Peter 1:22; 1 John 3:11; 3:23; 4:7; 4:11-12). That is what true biblical koinonia should look like.