Isra'il bin Yonus bin Abi Ishaq إسرائيل بن يونس بن أبي إسحاق · The Book of Agriculture

"I will lease (something) from you until I reach Makkah for such and such a payment, and if I travel for a month or such and such -something that he named- I will give you such and such in addition." They did not see anything wrong with that, but they did not like it if he said: "If I travel for more than a month I will deduct such and such from your lease."

"The Prophet forbade Al-Haql and it is Al-Muzabanah."