قَالَ عَلِيٌّ ع لَا بَأْسَ أَنْ يُسْلَفَ مَا يُوزَنُ فِيمَا يُكَالُ وَ مَا يُكَالُ فِيمَا يُوزَنُ.
Hadith.3949 - Wahb ibn Wahb narrated from Ja'far ibn Muhammad from his father (as): Imam Ali ibn Abi Talib (as) said: "There is no harm in advancing payment for what is weighed in exchange for what is measured, and for what is measured in exchange for what is weighed."