Hadith 2

Sahih Bukhari

Book 35: Sales in which a Price is paid for Goods to be Delivered Later (As-Salam)

Chapter 1

As-Salam by a definite known specified measure

باب السَّلَمِ فِي كَيْلٍ مَعْلُومٍ

Sahih al-Bukhari 2239b
حَدَّثَنَا مُحَمَّدٌ، أَخْبَرَنَا إِسْمَاعِيلُ، عَنِ ابْنِ أَبِي نَجِيحٍ، بِهَذَا ‏ ‏‏.‏
"‏ فِي كَيْلٍ مَعْلُومٍ وَوَزْنٍ مَعْلُومٍ ‏"
Ibn Abi Najih:

as above, mentioning only specific measure.