TRUTH Galatians 2:4-5

This matter arose because some false believers had infiltrated our ranks to spy on the freedom we have in Christ Jesus and to make us slaves. We did not give in to them for a moment, so that the truth of the gospel might be preserved for you. 

This matter arose because some false believers 
Acts 1:15-17  In those days Peter stood up among the believers (a group numbering about a hundred and twenty) and said, "Brothers and sisters, the Scripture had to be fulfilled in which the Holy Spirit spoke long ago through David concerning Judas, who served as a guide for those who arrested Jesus. He was one of our number and shared in our ministry."
2 Corinthians 11:26  I have been constantly on the move. I have been in danger from rivers, in danger from bandits, in danger from my fellow Jews, in danger from Gentiles; in danger in the city, in danger in the country, in danger at sea; and in danger from false believers.

had infiltrated our ranks to spy 
Jude 4  For certain individuals whose condemnation was written about long ago have secretly slipped in among you. They are ungodly people, who pervert the grace of our God into a license for immorality and deny Jesus Christ our only Sovereign and Lord.

on the freedom we have in Christ Jesus and to make us slaves 
Galatians 5:1  It is for freedom that Christ has set us free. Stand firm, then, and do not let yourselves be burdened again by a yoke of slavery.
Galatians 5:13  You, my brothers and sisters, were called to be free. But do not use your freedom to indulge the flesh; rather serve one another humbly in love.

We did not give in to them for a moment, so that the truth of the gospel might be preserved for you 
Galatians 2:14  When I saw that they were not acting in line with the truth of the gospel, I said to Cephas in front of them all, "You are a Jew, yet you live like a Gentile and not like a Jew. How is it, then, that you force Gentiles to follow Jewish customs?"

Scriptures taken from the Holy Bible, New International Version® NIV®, Copyright© 1973, 1978, 1984, 2011 by Biblica, Inc.® Used by permission. All rights reserved worldwide.