John 1:7 in the King James Version
The same came for a witness, to bear witness of the Light, that all men through him might believe.
Context
6 There came a man sent from God, whose name was John.
7 The same came as a witness, that he might testify about the light, that all might believe through him.
8 He was not the light, but was sent that he might testify about the light.