Cross reference
John 5:31
31 If I bear witness of myself, my witness is not true.
Proverbs 27:2
2 Let another man praise thee, and not thine own mouth; A stranger, and not thine own lips.
John 8:13-14
13 The Pharisees therefore said unto him, Thou bearest witness of thyself; thy witness is not true.
14 Jesus answered and said unto them, Even if I bear witness of myself, my witness is true; for I know whence I came, and whither I go; but ye know not whence I come, or whither I go.
John 8:54
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;
Revelation 3:14
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: