Uthman bin 'Asim bin Husayn عثمان بن عاصم بن حصين أبو حصين · The Book of Drinks

The Prophet forbade mixing Az-Zahuw and dried dates, and mixing Al-Busr and dried dates, and he said: "Soak each one of them on its own in vessels that are tied shut."

"The Messenger of Allah forbade mixing Al-Busr and raisins, and Al-Busr and dried dates, and he said: 'Soak each one of them on its own.'"