Acts 20:21

20:21 testifying to both Jews and Greeks about repentance toward God and faith in our Lord Jesus.

John 15:27

15:27 and you also will testify, because you have been with me from the beginning.

Hebrews 2:3-4

2:3 how will we escape if we neglect such a great salvation? It was first communicated through the Lord and was confirmed to us by those who heard him, 2:4 while God confirmed their witness with signs and wonders and various miracles and gifts of the Holy Spirit distributed according to his will.