John the Baptist gave testimony about Christ. He was a witness. As he gave testimony about Christ, people starting following Jesus (John 1;35-39, 2:11). His testimony and teaching pointed towards Christ and many started following Jesus (John 2:11).
John’s gospel itself was written as a testimony about Jesus. And in this gospel, John emphasis on the power of our Testimony (John:19:35, 20:31)
Samaritan women is another example. Through her testimony many Samaritans believed in Jesus. (John 4:28-29,39)
Jesus prayed that through the disciple’s testimony many would believe in Him. (John 17:20)
John also writes about people who are afraid testify Jesus because of their “fear of Jews”. (John 7:13, 9:22, 12:42, 19:38, 20:19)
John the Baptist boldly testified about Jesus when so many where afraid to. He is our example to testify about Jesus. And his testimony made many to follow Jesus.
Finally, Jesus commands us to testify about him. (John 15:27)
What are you testifying? Are you testifying boldly or are fearful to share your faith? Does your testimony point to Jesus?