John 8:14

Jesus answered and said to them, Even if I testify of myself, my testimony is true, for I know whence I came and whither I go; but you know not whence I come or whither I go.

John 1:17

for the law was given by Moses, the grace and truth were by Jesus Christ.

John 8:45-46

But because I tell you the truth you believe me not.

John 14:6

Jesus said to him, I am the way, and the truth, and the life. No one comes to the Father except by me.

John 17:17

Sanctify them by thy truth; thy word is truth.

John 18:37

Then Pilate said to him, Are you a king then? Jesus answered, As you say, I am a king. For this was I born, and for this I came into the world, that I should testify to the truth; every one who is of the truth hears my voice.

Revelation 3:14

And to the angel of the church in Laodicea write, These things says the Amen, the faithful and true witness, the beginning of the creation of God,

Treasury of Scripture Knowledge

Summary

For my mouth shall speak truth; and wickedness is an abomination to my lips.

Bible References

My mouth

John 1:17
for the law was given by Moses, the grace and truth were by Jesus Christ.
John 8:14
Jesus answered and said to them, Even if I testify of myself, my testimony is true, for I know whence I came and whither I go; but you know not whence I come or whither I go.
John 14:6
Jesus said to him, I am the way, and the truth, and the life. No one comes to the Father except by me.
John 17:17
Sanctify them by thy truth; thy word is truth.
John 18:37
Then Pilate said to him, Are you a king then? Jesus answered, As you say, I am a king. For this was I born, and for this I came into the world, that I should testify to the truth; every one who is of the truth hears my voice.
Revelation 3:14
And to the angel of the church in Laodicea write, These things says the Amen, the faithful and true witness, the beginning of the creation of God,