To find all the things Jesus said to his disciples, you need to get a New Testament and read the books of Matthew, Mark, Luke and John. Jesus said many things and taught many things. In certain Bibles that are specially marked, the word of Jesus are in red.
Some of the last things Jesus said to his disciples were these verses.
Mark 16:15 He said to them, “Go into all the world, and preach the Good News to the whole creation.
Matthew 28:18 Jesus came to them and spoke to them, saying, “All authority has been given to me in heaven and on earth. 19 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 teaching them to observe all things that I commanded you. Behold, I am with you always, even to the end of the age.” Amen.
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