New Revised Standard Version
But because of false believers secretly brought in, who slipped in to spy on the freedom we have in Christ Jesus, so that they might enslave us—

Contemporary English Version
We went there because of those who pretended to be followers and had sneaked in among us as spies. They had come to take away the freedom Christ Jesus had given us, and they were trying to make us their slaves.

New American Bible
but because of the false brothers secretly brought in, who slipped in to spy on our freedom that we have in Christ Jesus, that they might enslave us—

Douay-Rheims Bible
But because of false brethren unawares brought in, who came in privately to spy our liberty which we have in Christ Jesus, that they might bring us into servitude.

But because of false brethren unawares brought in, who came in privately to spy our liberty which we have in Christ Jesus, that they might bring us into servitude.

because.

Galatians 5:10,12 I have confidence in you in the Lord that you will not be of another mind: but he that troubleth you shall bear the judgment, whosoever he be. . . .

Acts 15:1,24 And some, coming down from Judea, taught the brethren: That, except you be circumcised after the manner of Moses, you cannot be saved. . . .

Acts 20:30 And of your own selves shall arise men speaking perverse things, to draw away disciples after them.

2 Corinthians 11:13,17,26 For such false apostles are deceitful workmen, transforming themselves into the apostles of Christ. . . .

1 John 4:1 Dearly beloved, believe not every spirit, but try the spirits if they be of God: because many false prophets are gone out into the world.

unawares.

2 Timothy 3:6 For of these sort are they who creep into houses and lead captive silly women laden with sins, who are led away with divers desires:

2 Peter 2:1,2 But there were also false prophets among the people, even as there shall be among you lying teachers who shall bring in sects of perdition and deny the Lord who bought them: bringing upon themselves swift destruction. . . .

Jude 1:4 For certain men are secretly entered in (who were written of long ago unto this judgment), ungodly men, turning the grace of our Lord God into riotousness and denying the only sovereign Ruler and our Lord Jesus Christ.

liberty.

Galatians 3:23-26 But before the faith came, we were kept under the law shut up, unto that faith which was to be revealed. . . .

Galatians 5:1,13 Stand fast and be not held again under the yoke of bondage. . . .

Psalm 51:12 Restore unto me the joy of thy salvation, and strengthen me with a perfect spirit.

Psalm 119:45 And I walked at large: because I have sought after thy commandments.

John 8:31-36 Then Jesus said to those Jews who believed him: If you continue in my word, you shall be my disciples indeed. . . .

2 Corinthians 3:17 Now the Lord is a Spirit. And where the Spirit of the Lord is, there is liberty.

1 Peter 2:16 As free and not as making liberty a cloak for malice, but as the servants of God.

2 Peter 2:19 Promising them liberty, whereas they themselves are the slaves of corruption. For by whom a man is overcome, of the same also he is the slave.

bring.

Galatians 4:3,9,10,25 So we also, when we were children, were serving under the elements of the world. . . .

Isaiah 51:23 And I will put it in the hand of them that have oppressed thee, and have said to thy soul: Bow down, that we may go over: and thou hast laid thy body as the ground, and as a way to them that went over.

2 Corinthians 11:20 For you suffer if a man bring you into bondage, if a man devour you, if a man take from you, if a man be lifted up, if a man strike you on the face.