James 1:26

If any man thinks he is a religious character among you, and bridleth not his tongue, but deceiveth his own heart, this man's religion is vain.

Galatians 6:3

For if any man conceits that he is something when he is nothing, he deceiveth himself.

James 1:22

But be ye doers of the word, and not hearers only, deceiving yourselves by false reasoning.

James 3:2-6

For in many things we all offend. If any man offend not in word, he is a perfect man, and capable of reining in the whole body.

1 Peter 3:10

"For he that would love life, and see good days, let him restrain his tongue from evil, and his lips from speaking guile.

Matthew 15:9

But in vain do they worship me, teaching doctrines the commandments of men.

Mark 7:7

Now vainly do they worship me, while teaching doctrines the commandments of men."

Luke 8:18

Take heed therefore how ye hear: for whosoever hath, to him shall be given; and whosoever hath not, even what he seemeth to have shall be taken away from.

1 Corinthians 3:18

Let no man deceive himself. If any man among you thinketh himself a wise man in this world, let him become a fool, that he may be wise.

1 Corinthians 15:2

by which also ye are saved; if ye cleave to that word I have preached to you, except haply ye have believed in vain.

1 Corinthians 15:15

Yea, and we also are found false witnesses for God; because we have testified on the behalf of God, that he raised up Christ: whom he raised not up, if indeed the dead are not raised.

Galatians 2:6

But from those who appeared men of the greatest importance, (what sort of men soever they were it maketh no difference to me: God accepteth not a man's person;) for these important personages in conference added nothing to me;

Galatians 2:9

And when they knew the grace which was bestowed on me, James and Cephas and John, who appeared to be the pillars [of the church], gave unto me and Barnabas the right hand of fellowship, that we should go unto the Gentiles, and they to the circumcision:

Galatians 3:4

have ye suffered so many things in vain? if it be yet in vain.

Ephesians 4:29

Let no loose discourse proceed out of your mouth, but whatever is good for useful edification, that it may communicate grace to the hearers.

Ephesians 5:4

or obscenity, or foolish talk, or loose witticisms; things which become not [a Christian], but rather thanksgiving.

Colossians 4:6

Let your discourse be always gracious, seasoned with salt, that ye may know how ye ought to reply to every man.

James 2:20

But wilt thou know, O vain man, that faith without works is dead?

Treasury of Scripture Knowledge

Summary

If any man among you seem to be religious, and bridleth not his tongue, but deceiveth his own heart, this man's religion is vain.

General references

Bible References

Seem

Luke 8:18
Take heed therefore how ye hear: for whosoever hath, to him shall be given; and whosoever hath not, even what he seemeth to have shall be taken away from.
1 Corinthians 3:18
Let no man deceive himself. If any man among you thinketh himself a wise man in this world, let him become a fool, that he may be wise.
Galatians 2:6
But from those who appeared men of the greatest importance, (what sort of men soever they were it maketh no difference to me: God accepteth not a man's person;) for these important personages in conference added nothing to me;
Galatians 6:3
For if any man conceits that he is something when he is nothing, he deceiveth himself.

Bridleth

James 3:2
For in many things we all offend. If any man offend not in word, he is a perfect man, and capable of reining in the whole body.
Ephesians 4:29
Let no loose discourse proceed out of your mouth, but whatever is good for useful edification, that it may communicate grace to the hearers.
Ephesians 5:4
or obscenity, or foolish talk, or loose witticisms; things which become not [a Christian], but rather thanksgiving.
Colossians 4:6
Let your discourse be always gracious, seasoned with salt, that ye may know how ye ought to reply to every man.
1 Peter 3:10
"For he that would love life, and see good days, let him restrain his tongue from evil, and his lips from speaking guile.

But

James 1:22
But be ye doers of the word, and not hearers only, deceiving yourselves by false reasoning.
Galatians 6:3
For if any man conceits that he is something when he is nothing, he deceiveth himself.

This

James 2:20
But wilt thou know, O vain man, that faith without works is dead?
Matthew 15:9
But in vain do they worship me, teaching doctrines the commandments of men.
Mark 7:7
Now vainly do they worship me, while teaching doctrines the commandments of men."
1 Corinthians 15:2
by which also ye are saved; if ye cleave to that word I have preached to you, except haply ye have believed in vain.
Galatians 3:4
have ye suffered so many things in vain? if it be yet in vain.

General references

1 Corinthians 15:14
and if Christ be not risen, vain indeed is our preaching, and vain also your faith.
James 3:3
Behold, we put bits into the horses' mouths, that they may obey us, and we turn about their whole body.