James 2:20

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

James 2:26

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

Romans 1:21

because though they knew [there was] a God, they glorified him not as God, nor gave him thanks, but became triflers in their disputations, and their stupid heart was darkened.

1 Corinthians 15:35-36

But will any man say, How are the dead raised up? and with what body do they come?

Galatians 5:6

For in Christ Jesus neither circumcision availeth any thing, nor uncircumcision, but faith exerting its energy by love.

Galatians 6:3

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

Colossians 2:8

Beware that no man make a prey of you by means of philosophy and vain delusion, after the tradition of men, after the principles of the world, and not after Christ:

1 Timothy 1:6

from which some, having swerved, have turned aside to vain babbling;

Titus 1:10

For there are many disorderly persons vainly talkative, and under a spirit of delusion, especially some of the circumcised;

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.

James 2:17

So also faith, if it hath not works, is dead 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 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.
Romans 1:21
because though they knew [there was] a God, they glorified him not as God, nor gave him thanks, but became triflers in their disputations, and their stupid heart was darkened.
1 Corinthians 15:35
But will any man say, How are the dead raised up? and with what body do they come?
Galatians 6:3
For if any man conceits that he is something when he is nothing, he deceiveth himself.
Colossians 2:8
Beware that no man make a prey of you by means of philosophy and vain delusion, after the tradition of men, after the principles of the world, and not after Christ:
1 Timothy 1:6
from which some, having swerved, have turned aside to vain babbling;
Titus 1:10
For there are many disorderly persons vainly talkative, and under a spirit of delusion, especially some of the circumcised;

That

James 2:14
What is the advantage, my brethren, if a man profess to have faith, but hath not works; can faith save him?

General references

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