John 1:7

7Heοὗτοςcameἦλθενasεἰςa witnessμαρτυρίαν,thatἵναhe might testifyμαρτυρήσῃconcerningπερὶtheτοῦLightφωτός,thatἵναallπάντεςmight believeπιστεύσωσινthroughδι’himαὐτοῦ.

This one came for testimony, so that he might testify concerning the Light, so that all might believe through him.