According to the Bible, after Jesus rose from the dead, He appeared to the apostles and more than 500 other eyewitnesses.  Before ascending to heaven, here were some his parting words...
Matthew 28:18-20
And Jesus came and spoke to them saying, "All authority has been given to Me in heaven and on earth.  Go therefore and make disciples of all the nations, baptizing them in the name of the Father and of the Son and of the Holy Spirit, teaching them to observe all things that I have commanded you: and lo, I am with you always, even to the end of the age."