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.

Jeremiah 9:8

Their tongue {is as} an arrow shot out; it speaketh deceit: {one} speaketh peaceably to his neighbour with his mouth, but in heart he layeth his wait. {in heart: Heb. in the midst of him} {his wait: or, wait for him}

Psalms 41:6

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

Psalms 144:8

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

Psalms 10:7

His mouth is full of cursing and deceit and fraud: under his tongue {is} mischief and vanity. {deceit: Heb. deceits} {vanity: or, iniquity}

Psalms 5:9

For {there is} no faithfulness in their mouth; their inward part {is} very wickedness; their throat {is} an open sepulchre; they flatter with their tongue. {faithfulness: or, stedfastness} {their mouth: Heb. his mouth, that is, the mouth of any of them} {very...: Heb. wickednesses}

Psalms 28:3

Draw me not away with the wicked, and with the workers of iniquity, which speak peace to their neighbours, but mischief {is} in their hearts.

James 1:8

A double minded man {is} unstable in all his ways.