John 5:36
New King James Version (NKJV)
36 But I have a greater witness than John's; for the works which the Father has given Me to finish — the very works that I do — bear witness of Me, that the Father has sent Me.
From BibleGateway.com: http://www.biblegateway.com/passage/?search=John 5:36&version=NKJV