In an amusingly self-serving ruling, Muhammad an-Najimi, a Saudi member of the prestigious Islamic Fiqh Academy of the Organization of the Islamic Conference, issued a tentative personal opinion (less binding than a fatwa) to Muslims that filling the gas tank with biofuels is sinful: "I warn Saudis who live abroad and who use alcohol instead of petrol that this case is related and falls within the parameters of what the prophet said." He refers here to a hadith in which Muhammad prohibited the buying, selling, transporting, drinking, or manufacturing of alcohol.