Matthew 28:18-20: “Then Jesus came to them and said, ‘All authority in heaven and on earth has been given to me.  Therefore go and make disciples of all nations, baptizing them in the name of the Father and of the Son and of the Holy Spirit, and teaching them to obey everything I have commanded you.  And surely I am with you always, to the very end of the age.’”

Our Authority of Ministry comes directly from our Lord Jesus who commands all believers to be His witness.  All believers are to be evangelists spreading the Word of the Lord to everyone everywhere.