Judges 6:31

But Jo'ash said to all who were arrayed against him, "Will you contend for Ba'al? Or will you defend his cause? Whoever contends for him shall be put to death by morning. If he is a god, let him contend for himself, because his altar has been pulled down."

Exodus 23:2

Thou shalt not follow the multitude for evil; neither shalt thou answer in a cause, to go after the multitude to pervert judgment.

Numbers 14:6

And Joshua the son of Nun, and Caleb the son of Jephunneh, of them that searched out the land, rent their garments.

Deuteronomy 13:5-18

And that prophet, or that dreamer of dreams, shall be put to death; for he hath spoken revolt against Jehovah your God who brought you out of the land of Egypt, and redeemed you out of the house of bondage, to draw thee out of the way that Jehovah thy God commanded thee to walk in; and thou shalt put evil away from thy midst.

Deuteronomy 17:2-7

If there be found in thy midst in any of thy gates which Jehovah thy God giveth thee, man or woman, that doeth what is evil in the sight of Jehovah thy God, in transgressing his covenant,

1 Kings 18:27

And it came to pass at noon that Elijah mocked them and said, Cry aloud; for he is a god; for he is meditating, or gone aside, or he is on a journey; perhaps he sleeps, and will awake.

1 Kings 18:29

And it came to pass when midday was past, that they prophesied until the time of the offering up of the oblation; but there was neither voice, nor any that answered, nor any attention.

1 Kings 18:40

And Elijah said to them, Seize the prophets of Baal; let not one of them escape! And they seized them; and Elijah brought them down to the torrent of Kishon, and slaughtered them there.

Psalm 115:4-7

Their idols are silver and gold, the work of men's hands:

Isaiah 41:23

declare the things that are to happen hereafter, that we may know that ye are gods; yea, do good, or do evil, that we may be astonished, and behold it together.

Isaiah 46:1

Bel is bowed down, Nebo bendeth; their idols are upon the beasts, and upon the cattle: the things ye carried are laid on, a burden to the weary beast.

Isaiah 46:7

They bear him on the shoulder, they carry him, and set him in his place; there he standeth, he doth not remove from his place: yea, one crieth unto him, and he answereth not; he saveth him not out of his trouble.

Jeremiah 10:5

They are as a palm-column of turned work, and they speak not; they are carried, for they cannot go. Be not afraid of them; for they cannot do evil, neither also is it in them to do good.

Jeremiah 10:11

Thus shall ye say unto them: The gods that have not made the heavens and the earth, these shall perish from the earth, and from under the heavens.

1 Corinthians 8:4

concerning then the eating of things sacrificed to idols, we know that an idol is nothing in the world, and that there is no other God save one.

Ephesians 5:11

and do not have fellowship with the unfruitful works of darkness, but rather also reprove them,

Treasury of Scripture Knowledge

Summary

And Joash said unto all that stood against him, Will ye plead for Baal? will ye save him? he that will plead for him, let him be put to death whilst it is yet morning: if he be a god, let him plead for himself, because one hath cast down his altar.

Bible References

Will ye plead

Numbers 14:6
And Joshua the son of Nun, and Caleb the son of Jephunneh, of them that searched out the land, rent their garments.
Ephesians 5:11
and do not have fellowship with the unfruitful works of darkness, but rather also reprove them,

Let him be

Deuteronomy 13:5
And that prophet, or that dreamer of dreams, shall be put to death; for he hath spoken revolt against Jehovah your God who brought you out of the land of Egypt, and redeemed you out of the house of bondage, to draw thee out of the way that Jehovah thy God commanded thee to walk in; and thou shalt put evil away from thy midst.
Deuteronomy 17:2
If there be found in thy midst in any of thy gates which Jehovah thy God giveth thee, man or woman, that doeth what is evil in the sight of Jehovah thy God, in transgressing his covenant,
1 Kings 18:40
And Elijah said to them, Seize the prophets of Baal; let not one of them escape! And they seized them; and Elijah brought them down to the torrent of Kishon, and slaughtered them there.

If he be

1 Kings 18:27
And it came to pass at noon that Elijah mocked them and said, Cry aloud; for he is a god; for he is meditating, or gone aside, or he is on a journey; perhaps he sleeps, and will awake.
Psalm 115:4
Their idols are silver and gold, the work of men's hands:
Isaiah 41:23
declare the things that are to happen hereafter, that we may know that ye are gods; yea, do good, or do evil, that we may be astonished, and behold it together.
Isaiah 46:1
Bel is bowed down, Nebo bendeth; their idols are upon the beasts, and upon the cattle: the things ye carried are laid on, a burden to the weary beast.
Jeremiah 10:5
They are as a palm-column of turned work, and they speak not; they are carried, for they cannot go. Be not afraid of them; for they cannot do evil, neither also is it in them to do good.
1 Corinthians 8:4
concerning then the eating of things sacrificed to idols, we know that an idol is nothing in the world, and that there is no other God save one.