ولا يجوز البيع إلى الحصاد والدياس والقطاف وقدوم الحاج فإن تراضيا بإسقاط الأجل قبل أن يأخذ الناس في الحصاد والدياس وقبل قدوم الحاج جاز البيع
Translation: Payment deadlines tied to harvest, threshing, fruit-picking or pilgrims’ arrival are disallowed; the text states that removing such an indefinite term by mutual agreement before the specified event begins may validate the sale.
Hasad is harvesting, diyas threshing, and qitaf fruit-picking. These are movable events rather than necessarily definite dates.
1. 'Pay when harvest begins' may leave the term uncertain.
2. The passage recognizes mutual removal of the indefinite deadline before the specified event occurs.
The wording taradiya requires mutual agreement; unilateral deletion is not what the clause says.