BUKHARI 2240b:
from Ibn Abū Najīḥ —
as above, saying, "He should pay the price in advance for a specified measure and for a specified period."
البخاري ٢٢٤٠b:
عن ابن ابو نجيح —
وَقَالَ فَلْيُسْلِفْ فِي كَيْلٍ مَعْلُومٍ إِلَى أَجَلٍ مَعْلُومٍ