«فَقَالَ الشَّيْخُ: مَا مِنِّي خِلَافٌ فَلَا يَكُنْ لِوَعْدِكَ إِخْلَافٌ»
The elder said: I offer no resistance; let there be no failure to honour your promise.
Khilāf means objection or disagreement; ikhlāf concerns breaking a promise. Their near sounds help the elder make acceptance conditional on the governor honouring his offer.
Lā yakun is a prohibitive construction with the jussive imperfect, urging that no breach occur. The courteous diction simultaneously exerts pressure to obtain payment. Form, meaning and strategic purpose work together.