Khalid bin al-Harith bin 'Ubaid خالد بن الحارث بن عبيد · The Book of Drinks

"The Messenger of Allah forbade Ad-Dubba', Al-Hantam, Al-Muzaffat, and An-Naqir, and that Al-Busr be mixed with dried dates, and that raisins be mixed with dried dates, and he wrote to the people of Hajar saying: 'Do not mix raisins and dried dates together.'"

"He forbade Ad-Dubba' (gourds) specifically."

"(Fruit) would be soaked for the Messenger of Allah forbade Ad-Dubba' (gourds), An-Naqir, and Al-Muzaffat."