Disciple

One who receives instruction from another; a scholar; a learner; especially, a follower who has learned to believe in the truth of the doctrine of his teacher; an adherent in doctrine; as, the disciples of Plato; the disciples of our Savior.

To teach; to train.

To punish; to discipline.

To make disciples of; to convert to doctrines or principles.

someone who believes and helps to spread the doctrine of another