Repeating a significant expression is not automatically redundant. Its second occurrence can reinforce a claim when each occurrence attaches to a distinct part of the report.
«وَبِالْحَقِّ أَنْزَلْنَاهُ وَبِالْحَقِّ نَزَلَ»
We sent it down with truth, and with truth it descended. (Qurʾān 17:105)
The first «بالحق» qualifies the act of sending down; the second qualifies the event of descent. The repeated phrase therefore strengthens two related assertions rather than mechanically repeating one.
Good rhetorical repetition serves meaning, confirmation, or organization. Mere frequency, without such a function, does not by itself improve expression.