Anaphora consists of repeating a sequence of words at the beginnings of neighboring clauses , thereby lending tham emphasis.

In contrast, an epistrophe (or epiphora) is repeating words at the clauses' ends.

Anaphora is most commonly found in poetry , though it can be found in prose as well.

Winston Churchill	We shall fight on the beaches
Martin Luther King	I have a dream How long? not long Now is the time
Shakespeare	It is too This
Homer Simpson	I want to ...
Charles Dickens	It was the best of times