New Revised Standard Version
not that there is another gospel, but there are some who are confusing you and want to pervert the gospel of Christ.

Contemporary English Version
when there is really only one true message. But some people are causing you trouble and want to make you turn away from the good news about Christ.

New American Bible
(not that there is another). But there are some who are disturbing you and wish to pervert the gospel of Christ.

Douay-Rheims Bible
Which is not another: only there are some that trouble you and would pervert the gospel of Christ.

Which is not another: only there are some that trouble you and would pervert the gospel of Christ.

but.

Galatians 2:4 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.

Galatians 4:17 They are zealous in your regard not well: but they would exclude you, that you might be zealous for them.

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. . . .

Galatians 6:12,13,17 For as many as desire to please in the flesh, they constrain you to be circumcised, only that they may not suffer the persecution of the cross of Christ. . . .

Acts 15:1-5,24 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.

Romans 16:17,18 Now I beseech you, brethren, to mark them who make dissensions and offences contrary to the doctrine which you have learned and avoid them. . . .

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

pervert.

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. . . .

Jeremiah 23:26 How long shall this be in the heart of the prophets that prophesy lies, and that prophesy the delusions of their own heart?

Matthew 24:24 For there shall arise false Christs and false prophets and shall shew great signs and wonders, insomuch as to deceive (if possible) even the elect.

Acts 13:10 Said: O full of all guile and of all deceit, child of the devil, enemy of all justice, thou ceases not to pervert the right ways of the Lord.

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. . . .

2 Corinthians 2:17 For we are not as many, adulterating the word of God: but with sincerity: but as from God, before God, in Christ we speak.

2 Corinthians 4:2 But we renounce the hidden things of dishonesty, not walking in craftiness nor adulterating the word of God: but by manifestation of the truth commending ourselves to every man's conscience, in the sight of God.

1 Timothy 4:1-3 Now the Spirit manifestly saith that in the last times some shall depart from the faith, giving heed to spirits of error and doctrines of devils, . . .

2 Timothy 2:18 Who have erred from the truth, saying that the resurrection is past already, and have subverted the faith of some.

2 Timothy 3:8,9 Now as Jannes and Mambres resisted Moses, so these also resist the truth, men corrupted in mind, reprobate concerning the faith. . . .

2 Timothy 4:3,4 For there shall be a time when they will not endure sound doctrine but, according to their own desires, they will heap to themselves teachers having itching ears: . . .

Titus 1:10,11 For there are also many disobedient, vain talkers and seducers: especially they who are of the circumcision. . . .

2 Peter 2:1-3 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. . . .

1 John 2:18,19,26 Little children, it is the last hour: and as you have heard that Antichrist cometh, even now there are become many Antichrists: whereby we know that it is the last hour. . . .

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.

2 John 1:7,10 For many seducers are gone out into the world who confess not that Jesus Christ is come in the flesh. This is a seducer and an antichrist. . . .

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.

Revelation 2:2,6,14,15,20 I know thy works and thy labour and thy patience and how thou canst not bear them that are evil. And thou hast tried them who say they are apostles and are not: and hast found them liars: . . .

Revelation 12:9 And that great dragon was cast out, that old serpent, who is called the devil and Satan, who seduceth the whole world. And he was cast unto the earth: and his angels were thrown down with him.

Revelation 13:14 And he seduced them that dwell on the earth, for the signs which were given him to do in the sight of the beast: saying to them that dwell on the earth that they should make the image of the beast which had the wound by the sword and lived.

Revelation 19:20 And the beast was taken, and with him the false prophet who wrought signs before him, wherewith he seduced them who received the character of the beast and who adored his image. These two were cast alive into the pool of fire burning with brimstone.

Revelation 20:3 And he cast him into the bottomless pit and shut him up and set a seal upon him, that he should no more seduce the nations till the thousand years be finished. And after that, he must be loosed a little time.