John 8:14

If I testify concerning myself, my testimony is true; for I know whence I came, and whither I go. You know not whence I come, or whither I go.

John 1:17

Because the law was given by Moses; grace and truth came through Jesus Christ.

John 8:45-46

And because I speak the truth, you do not believe me.

John 14:6

Jesus says to him, I am the way, and the truth, and the life: no one cometh to the Father, but through me.

John 17:17

Sanctify them through the truth: thy word is truth.

John 18:37

Then Pilate said to Him, Then, art thou not a king? Jesus responded, Thou says that I am king. Unto this I was born, and unto this I have come into the world, in order that I may bear witness to the truth. Every one being of the truth hears my voice.

Revelation 3:14

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

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
Because the law was given by Moses; grace and truth came through Jesus Christ.
John 8:14
If I testify concerning myself, my testimony is true; for I know whence I came, and whither I go. You know not whence I come, or whither I go.
John 14:6
Jesus says to him, I am the way, and the truth, and the life: no one cometh to the Father, but through me.
John 17:17
Sanctify them through the truth: thy word is truth.
John 18:37
Then Pilate said to Him, Then, art thou not a king? Jesus responded, Thou says that I am king. Unto this I was born, and unto this I have come into the world, in order that I may bear witness to the truth. Every one being of the truth hears my voice.
Revelation 3:14
And to the angel of the church in Laodicea write; The Amen, the faithful and true witness, the beginning of the creation of God, says these things;