Psalm 12:2

They speak vanity every one with his neighbor: with flattering lips and with a double heart do they speak.

Psalm 41:6

And if he cometh to see me, he speaketh vanity: his heart gathereth iniquity to itself; when he goeth abroad, he telleth it.

Romans 16:18

For they that are such serve not our Lord Jesus Christ, but their own belly; and by good words and fair speeches deceive the hearts of the simple.

Psalm 10:7

His mouth is full of cursing and deceit and fraud: under his tongue is mischief and vanity.

Jeremiah 9:8

Their tongue is as an arrow shot out; it speaketh deceit: one speaketh peaceably to his neighbor with his mouth, but in heart he layeth his wait.

1 Chronicles 12:33

Of Zebulun, such as went forth to battle, expert in war, with all instruments of war, fifty thousand, who could keep rank: they were not of double heart.

Psalm 5:9

For there is no faithfulness in their mouth; their inward part is very wickedness; their throat is an open sepulcher; they flatter with their tongue.

Psalm 28:3

Draw me not away with the wicked, and with the workers of iniquity, who speak peace to their neighbors, but mischief is in their hearts.

Psalm 144:8

Whose mouth speaketh vanity, and their right hand is a right hand of falsehood.

James 1:8

A man unsettled in his opinions is unstable in all his ways.

Psalm 36:3-4

The words of his mouth are iniquity and deceit: he hath ceased to be wise, and to do good.

Psalm 38:12

They also that seek after my life lay snares for me: and they that seek my hurt speak mischievous things, and imagine deceits all the day long.

Psalm 52:1-4

To the chief Musician, Maschil, A Psalm of David, when Doeg the Edomite came and told Saul, and said to him, David is come to the house of Ahimelech. Why boastest thou thyself in mischief, O mighty man? the goodness of God endureth continually.

Psalm 55:21

The words of his mouth were smoother than butter, but war was in his heart: his words were softer than oil, yet were they drawn swords.

Psalm 59:12

For the sin of their mouth and the words of their lips let them even be taken in their pride: and for cursing and lying which they speak.

Psalm 62:4

They only consult to cast him down from his excellence: they delight in lies: they bless with their mouth, but they curse inwardly. Selah.

Psalm 144:11

Rid me, and deliver me from the hand of strange children, whose mouth speaketh vanity, and their right hand is a right hand of falsehood:

Proverbs 20:19

He that goeth about as a tale-bearer revealeth secrets; therefore meddle not with him that flattereth with his lips.

Proverbs 29:5

A man that flattereth his neighbor spreadeth a net for his feet.

Jeremiah 9:2-6

Oh that I had in the wilderness a lodging-place of way-faring men; that I might leave my people, and go from them! for they are all adulterers, an assembly of treacherous men.

Ezekiel 12:24

For there shall no more be any vain vision nor flattering divination within the house of Israel.

1 Thessalonians 2:5

For neither at any time used we flattering words, as ye know, nor a cloke of covetousness; God is witness:

Treasury of Scripture Knowledge

Summary

They speak vanity every one with his neighbour: with flattering lips and with a double heart do they speak.

A double heart

Bible References

Flattering

Psalm 5:9
For there is no faithfulness in their mouth; their inward part is very wickedness; their throat is an open sepulcher; they flatter with their tongue.
Psalm 28:3
Draw me not away with the wicked, and with the workers of iniquity, who speak peace to their neighbors, but mischief is in their hearts.
Psalm 62:4
They only consult to cast him down from his excellence: they delight in lies: they bless with their mouth, but they curse inwardly. Selah.
Proverbs 20:19
He that goeth about as a tale-bearer revealeth secrets; therefore meddle not with him that flattereth with his lips.
Proverbs 29:5
A man that flattereth his neighbor spreadeth a net for his feet.
Ezekiel 12:24
For there shall no more be any vain vision nor flattering divination within the house of Israel.
Romans 16:18
For they that are such serve not our Lord Jesus Christ, but their own belly; and by good words and fair speeches deceive the hearts of the simple.
1 Thessalonians 2:5
For neither at any time used we flattering words, as ye know, nor a cloke of covetousness; God is witness:

A double heart

1 Chronicles 12:33
Of Zebulun, such as went forth to battle, expert in war, with all instruments of war, fifty thousand, who could keep rank: they were not of double heart.

General references

Genesis 29:19
And Laban said, It is better that I give her to thee, than that I should give her to another man: abide with me.
Judges 16:6
And Delilah said to Samson, Tell me, I pray thee, in what thy great strength lieth, and with what thou mayest be bound to afflict thee.
Habakkuk 1:3
Why dost thou show me iniquity, and cause me to behold grievance? for devastation and violence are before me: and there are that raise strife and contention.
Acts 12:22
And the people gave a shout, saying, It is the voice of a god, and not of a man.