لَا تُهْمِلِ الْوَقْتَ، لَا تُهْمِلِ الْوَقْتَ.
Do not waste time; do not waste time.
If the addressee is inattentive or the warning is serious, repeating the prohibition can intensify emphasis, alertness, and impact. The expansion then serves a function. Merely copying the same expression when there is no additional effect is not automatically a rhetorical virtue.
Judging repetition requires attention to the listener's condition and the order of discourse. It is equally unsound to classify all repetition as padding or to treat every repeated expression as automatically beneficial amplification.