وَإِنِّي لَكَ لَمِنَ الْمُنْذِرِينَ، وَعَلَيْكَ مِنَ الْمُحَذِّرِينَ
I am among those who warn you and caution you.
Mundhirīn / muḥadhdhirīn are related words of warning and caution. Their parallel forms reinforce the rhythm. After praising the poetry, the judge turns to a serious warning: using such deception in another court may have grave consequences.