«وَمِنْهُ لُزُومُ مَا لَا يَلْزَمُ، وَهُوَ أَنْ يَجِيءَ قَبْلَ حَرْفِ الرَّوِيِّ أَوْ مَا فِي مَعْنَاهُ مِنَ الْفَاصِلَةِ مَا لَيْسَ بِلَازِمٍ»
“An extra sound pattern, not required by the normal rhyme, is maintained before the rhyme letter or the corresponding prose ending.”
«فَأَمَّا الْيَتِيمَ فَلَا تَقْهَرْ وَأَمَّا السَّائِلَ فَلَا تَنْهَرْ»
“So do not oppress the orphan, nor rebuke the petitioner.”
Taqhar / tanhar repeat more phonetic structure than the bare rhyme rule requires. The figure names this deliberate added constraint.