John 5:31

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

John 8:13-14

Then the Pharisees said unto him, Thou dost bear 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 glorifies 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 unto the angel of the congregation of the Laodiceans write; Behold, he who saith, Amen, the faithful and true witness, the beginning of the creation of God:

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