I found the following at Ligonier: Witnessing vs. Evangelism "But you will receive power when the Holy Spirit comes on you; and you will be my witnesses in Jerusalem, and in all Judea and Samaria, and to the ends of the earth." ~ Acts 1:8 From: “ witnesses ” μάρτυρες A witness (literally (judicially) or figuratively (genitive case)); by analogy, a "martyr" ~ From Quotes Cosmos The following is a good video: The Definition of Evangelism --- Sam Chan