James 2:20

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

James 2:26

For as the body without the spirit is dead, so also faith without works is dead.

Romans 1:21

Because though they knew God, they did not glorify him as God, nor were they thankful to him; but became perverse in their reasonings, and their senseless minds were darkened;

1 Corinthians 15:35-36

But some one will say, How are the dead to rise? and with what body do they come?

Galatians 5:6

For in Christ Jesus neither circumcision availeth anything, nor uncircumcision; but faith working by love.

Galatians 6:3

For if a man thinketh himself to be something, when he is nothing, he deceiveth himself.

Colossians 2:8

Beware lest there be some one who shall make a prey of you through philosophy and vain deceit, according to the tradition of men, according to the rudiments of the world, and not according to Christ.

1 Timothy 1:6

from which some swerving turned aside to vain babbling,

Titus 1:10

For there are many unruly vain talkers and deceivers, especially they of the circumcision;

James 1:26

If any one thinks that he is religious, and bridles not his tongue, but deceives his own heart, this mans religion is vain.

James 2:17

So also faith, if it hath not works, is dead in itself.

Treasury of Scripture Knowledge

Summary

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

That

General references

Bible References

O vain

James 1:26
If any one thinks that he is religious, and bridles not his tongue, but deceives his own heart, this mans religion is vain.
Romans 1:21
Because though they knew God, they did not glorify him as God, nor were they thankful to him; but became perverse in their reasonings, and their senseless minds were darkened;
1 Corinthians 15:35
But some one will say, How are the dead to rise? and with what body do they come?
Galatians 6:3
For if a man thinketh himself to be something, when he is nothing, he deceiveth himself.
Colossians 2:8
Beware lest there be some one who shall make a prey of you through philosophy and vain deceit, according to the tradition of men, according to the rudiments of the world, and not according to Christ.
1 Timothy 1:6
from which some swerving turned aside to vain babbling,
Titus 1:10
For there are many unruly vain talkers and deceivers, especially they of the circumcision;

That

James 2:14
What doth it profit, my brethren, if any one say that he hath faith, and have not works? Can his faith save him?

General references

1 Corinthians 15:14
and if Christ hath not risen, then is our preaching vain, and vain also is your faith.