John 5:31

If I bear witness of myself, my witness is not true.

John 8:13-14

The Pharisees therefore said unto him, Thou bearest witness of thyself; thy witness is not true.

John 8:54

Jesus answered, If I glorify myself, my glory is nothing: it is my Father that glorifieth me; of whom ye say, that he is your God;

Proverbs 27:2

Let another man praise thee, and not thine own mouth; A stranger, and not thine own lips.

Revelation 3:14

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

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American Standard Version Public Domain