«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.
Mā minnī khilāfun expresses acceptance; fa-lā yakun li-waʿdika ikhlāfun insists that the other party honour the promised payment. The related sounds of khilāf and ikhlāf unite consent and performance.
The passage is more than decorative wordplay. The agreement depends in practice on what was promised actually being delivered. Quoting only the first clause would omit the elder's insistence on fulfilment.
Practice: Which clause demands performance? “Fa-lā yakun li-waʿdika ikhlāfun.”