What exactly is forbidden: dried gourd containers or eating gourds, and why? What is al-Hantam, and what is the meaning of "jars" (jirar)? And is the reason for the prohibition the quick fermentation of dates and raisins in these vessels?

What is prohibited is the use of vessels for wine to speed up its fermentation, and this prohibition has been abrogated. The Prophet, peace and blessings be upon him, permitted the use of all vessels, and forbade every intoxicant. As for al-hantam, which are jars, this prohibition has also been abrogated.