There was a man sent from God, whose name was John. John 1:33; Mal 3:1; Matt 3:1; Mark 1:2; Mark 1:4; Luke 3:3; Luke 7:27; 7 The same came for a witness, to bear witness of the Light, that all men through him might believe. 8 He was not that Light, but was sent to bear witness of that Light.
i believe the him in verse 7 refers to john that through him they wood believe in the christ.
Malachi 3
1 Behold, I will send my messenger, and he shall prepare the way before me: and the Lord, whom ye seek, shall suddenly come to his temple, even the messenger of the covenant, whom ye delight in: behold, he shall come, saith the LORD of hosts
luke7
27 This is he, of whom it is written, Behold, I send my messenger before thy face, which shall prepare thy way before thee.
Matthew 3
In those days came John the Baptist, preaching in the wilderness of Judaea, Mark 1:4; Luke 3:3; 2 And saying, Repent ye: for the kingdom of heaven is at hand. 3 For this is he that was spoken of by the prophet Esaias, saying, The voice of one crying in the wilderness, Prepare ye the way of the Lord, make his paths straight
john1
23 He said, I am the voice of one crying in the wilderness, Make straight the way of the Lord, as said the prophet Esaias.
mark 16
15 And he said unto them, Go ye into all the world, and preach the gospel to every creature. 16 He that believeth and is baptized shall be saved; but he that believeth not shall be damned.
John 15
Ye have not chosen me, but I have chosen you, and ordained you, that ye should go and bring forth fruit, and that your fruit should remain: that whatsoever ye shall ask of the Father in my name, he may give it you
so God sent us to be a witness of Christ and to preach the gosple to every creature on the earth.