أُولَٰئِكَ عَلَىٰ هُدًى مِنْ رَبِّهِمْ وَأُولَٰئِكَ هُمُ الْمُفْلِحُونَ
Those are upon guidance from their Lord, and those are the successful. (Al-Baqarah 2:5)
The second أُولَٰئِكَ makes the success of the same group especially prominent. The first clause establishes their guidance; the repeated demonstrative introduces a distinct, reinforced statement of their success.
Taqrīr strengthens an idea in the hearer’s mind, while īḍāḥ makes it clearer. Repetition can therefore be a deliberate means of reinforcing a message rather than redundant wording.