Anaphora
The repetition of the same word or phrase at the beginning of successive clauses or lines.
Anaphora builds rhythm and momentum by starting a run of phrases the same way. Writers and speakers use it to hammer an idea home, create emotional swell, and make passages memorable. The repeated opening acts like a drumbeat under the changing words that follow.
Example
The opening’s repeated “it was the”—best of times, worst of times, and so on—uses anaphora to swing between extremes and set the novel’s divided world.
A Tale of Two Cities · Charles Dickens