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KJV - The same came for a witness, to bear witness of the Light, that all men through him might believe.
ASV - The same came for witness, that he might bear witness of the light, that all might believe through him.
BBE - He came for witness, to give witness about the light, so that all men might have faith through him.
WEB - The same came as a witness, that he might testify about the light, that all might believe through him.
YLT - this one came for testimony, that he might testify about the Light, that all might believe through him;