KJV : The same <3778> came <2064> (5627) for <1519> a witness <3141>, to <2443> bear witness <3140> (5661) of <4012> the Light <5457>, that <2443> all <3956> [men] through <1223> him <846> might believe <4100> (5661).

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NASB : He came as a witness, to testify about the Light, so that all might believe through him.

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NASB# : He came<2064> as a witness<3141>, to testify<3140> about<4012> the Light<5457>, so<2443> that all<3956> might believe<4100> through<1223> him.