Nineteen-Day Fast to be the one foretold by the Báb, accepted the fast, but altered many of its details and regulations. The Bahá'í fast resembles fasting practices of several other religions. Lent is a period of fasting for Christians, Yom Kippur and many other holidays for Jews, and the fast of Ramadan is practiced by Muslims. The Bahá'í fasting most resembles the fast of Ramadan, except that the period of fasting is defined as a fixed Bahá'í month, whereas Muslims fast during a lunar month, whose specific Gregorian dates vary from year to year. Bahá'u'lláh established the guidelines of the fast in
Said Ramadan the battle against communism; by the end of the 1950s, "the CIA was overtly backing Ramadan. While it's too simple to call him a US agent, in the 1950s and 1960s the United States supported him as he took over a mosque in Munich, kicking out local Muslims to build what would become one of the Brotherhood's most important centers – a refuge for the beleaguered group during its decades in the wilderness. In the end, the US didn't reap much for its efforts, as Ramadan was more interested in spreading his Islamist agenda than fighting communism." Said Ramadan was