There are many references of it like this one i quickly find, but if you want Tomorrow at office i can get some more precise:

Attempts to ban coffee during these early years occurred quite regularly - often to little effect. In 1511, Khair Beg, the corrupt governor of Mecca, was executed after attempting to ban coffee - fearing that it's influence might foster opposition to his rule. The sultan on hearing about this declared that coffee is sacred and ordered the governor's death. Another try at banning coffee came from The Grand Vizir of the Ottoman Empire in 1656. He prohibited coffee and closed the coffee houses of Turkey. The penalty for drinking it, however, was nothing too serious - just a dunk in the Bosphorous in a leather satchel.