In every mission’s conference we talk about the Great Commission. It is found in several places in the gospels, but most often referenced from Matthew 28.
18 Then Jesus came to them and said, “All authority in heaven and on earth has been given to me. 19 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, 20 and teaching them to obey everything I have commanded you. And surely I am with you always, to the very end of the age.”– Matt. 28:18-20 NIV