وَلَئِنْ سَأَلْتَهُمْ مَنْ خَلَقَهُنَّ لَيَقُولُنَّ خَلَقَهُنَّ الْعَزِيزُ الْعَلِيمُ
If asked who created them, they would say, “The Mighty, the Knowing created them.” (Al-Zukhruf 43:9)
Here «خَلَقَهُنَّ» explicitly states the past-tense verb of creation with its object suffix. «الْعَزِيزُ» is the nominative agent and «الْعَلِيمُ» describes it. Although the question already mentions creating, the answer repeats the verb.
The repetition is not empty: the action is expressly asserted and linked with divine might and knowledge. These descriptive names make the claim more forceful.
In «لَيَقُولُنَّ اللَّهُ» the act is recovered from the question, whereas this answer pronounces the act. Both may be rhetorically justified, but for different purposes.