If a person says, “I love God,” yet [in reality] hates his brother, he is a liar. For the person who does not love his brother, whom he has seen, cannot [possibly] love God, whom he has never seen.
Now to summarize: All of you should think alike. Be sympathetically understanding [toward one another]. Be loving toward [your] brothers [and sisters]. Be tender-hearted and humble-minded.
[Since] you have purified your souls by [your] obedience to the truth [i.e., the Gospel message], which produces a genuine love for your brothers, [now] you should have this kind of fervent, heartfelt love for one another.
We ought to thank God for you always, brothers, since it is proper, because your faith is growing so much and the love that every one of you has for each other is increasing more and more.
For you brothers were called [by God] to enjoy your freedom; but do not use this freedom as an excuse for living a sinful life; instead, use it to render loving service to each other.
And this is His commandment: We should believe in the name of His Son Jesus Christ [i.e., the person of Christ], and love one another, just as He has commanded us to do.
For in [our relationship with] Christ neither the practice of circumcision nor refraining from its practice matters in any way; but [all that really matters is having a genuine] faith [in Christ] that causes us to work [for Him] out of a genuine love [for Him and others].
So, the large number of believers was united in heart and soul [i.e., mind and spirit] and not one of them said that anything he owned [really] belonged to him, but they shared all things in common.
And when the day of Pentecost came [Note: This was a Jewish festival held fifty days following the Passover Festival. Lev. 23:15-21], they [i.e., the twelve apostles] were all gathered together in one place [i.e., probably the Temple area].