The same came for a witness,— To bear testimony. The next sentence may be understood as explanatory of that which goes before, He came for a testimony, that is, to bear testimony concerning that light. Some commentators apply the word Him, in the next clause, to the Light here spoken of, and others to John, as the instrument of men's belief. By believing we are to understand the acknowledgingwiththeunderstanding and heart, and receiving Christ as the Messiah.
Related Commentaries of John 1:7
John 1:7
7 The same came for a witness, to bear witness of the Light, that all men through him might believe.