1. John 17:11
And I am no longer in the world, and they are in the world, and I am coming to you. Holy Father, keep them in your name, which you have given to me, so that they may be one, just as we are. Read John 17:11
2. Acts 2:44–45
And all who believed were in the same place, and had everything in common. And they began selling their possessions and property, and distributing these things to all, to the degree that anyone had need. Read Acts 2:44–45
3. Romans 14:1–3
Now receive the one who is weak in faith, but not for quarrels about opinions. One believes he may eat all things, but the one who is weak eats only vegetables. The one who eats must not despise the one who does not eat, and the one who does not eat must not judge the one who eats, because God has accepted him. Read Romans 14:1–3
4. Galatians 3:28
There is neither Jew nor Greek, there is neither slave nor free, there is neither male and female, for you are all one in Christ Jesus. Read Galatians 3:28
5. Ephesians 4:4–6
one body and one Spirit (just as also you were called with one hope of your calling), one Lord, one faith, one baptism, one God and Father of all, who is over all, and through all, and in all. Read Ephesians 4:4–6
Bonus: 3 Famous Christian Quotes about Unity, Church Fellowship, and Community
1. Beware of Teachers Arising After the Church’s Foundation
We ought to remain in that Church which was founded by the Apostles and continues to this day. If ever you hear of any that are called Christians taking their name not from the Lord Jesus Christ, but from some other, for instance, Marcionites, Valentinians, men of the mountain or the plain, you may be sure that you have there not the Church of Christ, but the synagogue of Antichrist. For the fact that they took their rise after the foundation of the Church is proof that they are those whose coming the Apostle foretold. And let them not flatter themselves if they think they have Scripture authority for their assertions, since the devil himself quoted Scripture, and the essence of the Scriptures is not the letter, but the meaning. Otherwise, if we follow the letter, we too can concoct a new dogma and assert that such persons as wear shoes and have two coats must not be received into the Church.
—Jerome
2. The Spirit Unites Christians with One Another and God
We all, receiving one and the same Spirit, I mean the Holy Spirit, are in some sort blended together with one another and with God. For if, we being many, Christ, who is the Spirit of the Father and His own Spirit, dwells in each one of us severally, still the Spirit is one and indivisible, binding together the dissevered spirits of the individualities of one and all of us, as we have a separate being, in His own natural singleness into unity, causing us all to be shown forth in Him, through Himself, and as one. For as the power of His holy flesh makes those in whom it exists to be of the same body, so likewise also the indivisible Spirit of God that abides in all, being one, binds all together into spiritual unity.
—Cyril of Alexandria
3. The Whole Church Body Should Be Cared For
It is not customary that an intelligent person clothes and cares for one part of his body and leaves the rest destitute and naked. Oh, no. The intelligent person is solicitous for all his members. Thus it should be with those who are the Lord’s church and body. All those who are born of God, who are gifted with the Spirit of the Lord, and who, according to the Scriptures, are called into one body of love in Christ Jesus, are prepared by such love to serve their neighbors, not only with money and goods, but also after the example of their Lord and Head, Jesus Christ, in an evangelical manner, with life and blood.… Behold, such a community we teach.
—Menno Simons