KJV - He was not that Light, but was sent to bear witness of that Light.

ASV - He was not the light, but `came' that he might bear witness of the light.

BBE - He himself was not the light: he was sent to give witness about the light.

WEB - He was not the light, but was sent that he might testify about the light.

YLT - that one was not the Light, but -- that he might testify about the Light.

Notes