They

Psalm 10:7
His mouth is full of cursing, deceit, and violence; trouble and malice are under his tongue.

Psalm 36:3, 4
The words of his mouth are wicked and deceitful; he has ceased to be wise and well-doing. . . .

Psalm 38:12
Those who seek my life lay snares; those who wish me harm speak destruction, and plot deceit all day long.

Psalm 41:6
My visitor speaks falsehood; he gathers slander in his heart; he goes out and spreads it abroad.

Psalm 52:1-4
Why do you boast of evil, O mighty man? The loving devotion of God endures all day long. . . .

Psalm 59:12
By the sins of their mouths and the words of their lips, let them be trapped in their pride, in the curses and lies they utter.

Psalm 144:8, 11
whose mouths speak falsehood, whose right hands are deceitful. . . .

Jeremiah 9:2-6, 8
If only I had a traveler's lodge in the wilderness, I would abandon my people and depart from them, for they are all adulterers, a crowd of faithless people. . . .

flattering

Psalm 5:9
For not a word they speak can be trusted; destruction is within them. Their throats are open graves; their tongues practice flattery.

Psalm 28:3
Do not drag me away with the wicked, and with the workers of iniquity, who speak peace to their neighbors while malice is in their hearts.

Psalm 62:4
They fully intend to topple him from his lofty perch; they delight in lies; with their mouths they bless, but inwardly they curse. Selah

Proverbs 20:19
He who reveals secrets is a constant gossip; avoid the one who babbles with his lips.

Proverbs 29:5
A man who flatters his neighbor spreads a net for his feet.

Ezekiel 12:24
For there will be no more false visions or flattering divinations within the house of Israel,

Romans 16:18
For such people are not serving our Lord Christ, but their own appetites. By smooth talk and flattery they deceive the hearts of the naive.

1 Thessalonians 2:5
As you know, we never used words of flattery or any pretext for greed. God is our witness!

a double heart.

1 Chronicles 12:33
From Zebulun: 50, 000 fit for service, trained for battle with all kinds of weapons of war, who with one purpose were devoted to David.

James 1:8
He is a double-minded man, unstable in all his ways.