Returning to the same word, the same phrase, or the same construction, at the beginning of successive verses or sentences (anaphora) or throughout the text, to give rhythm, emphasis, or insistence.
In the Odyssey
three times I lunged, and my spirit urged me to hold her; three times she flew from my hands, like a shadow or a dream.
"Three times… three times" repeats the same construction in the attempt and in the failure: each gesture and each loss is told in the same way. The insistence shows the obstinacy of Odysseus and how hard it is to admit that a shadow cannot be held.