سَيَظْهَرُ الْحَقُّ. نَعَمْ، سَيَظْهَرُ الْحَقُّ.
The truth will become evident. Yes, the truth will become evident.
If the repeat counters doubt or heightens assurance in a suitable setting, it can be effective iṭnāb through repetition. Repetition with no relevant purpose may instead be empty padding.
An analysis should explain what is gained in the listener's understanding or confidence at the second occurrence. Merely counting identical clauses does not establish rhetorical excellence.