Every day during the month of Ramadan, muslims fast from dawn to dusk. They abstain from food, drink, and sex.
Those who are unable to fast during Ramadan, such as the sick or pregnant, can make up the fast for an equal number of days anytime during the year.
People who cannot fast at any time must feed a needy person for every day of fasting they miss.
There are a number of fast days throughout the year in Judaism.
25 hour fasts - from the start of the Jewish day (sunset the evening before) until nightfall on the day concerned.
Daily fasts - from sunrise until sunset only (therefore the ones in the winter are easier than the ones in the summer).
Some other fasts.
Jewish fasting is a complete fast - one is not allowed to eat or drink anything for the duration of the fast. Of course, if it would be dangerous for one to fast (say if you're diabetic), one mustn't fast. But the decision to eat or drink, especially on Yom Kippur (as the holiest day in the year) should be made after consultation with both a Rabbi and a Doctor.
The obligation to fast commences when a boy is Bar Mitzvah (13) and a girl is Bat Mitzvah (12). Most children would fast for one or two years before this, and even younger children, while they shouldn't fast, should still mark the day by not eating luxury foods, sweets or chocolate.
A huge majority of Jews fast on Yom Kippur, however religious they are. Only religious Jews fast on most of the other days.
In Christianity, fasting is considered to be a spiritual discipline. Fasting involves denying yourself some form of sustenance (certain foods or all foods and/or drinks) for a period of time. Fasting is often combined with prayer, bible study, or meditation to elevate the spiritual aspect of the fast.
The word fast is derived from the Hebrew term tsom, which refers to the practice of self-denial. In New Testament (koine) Greek (including the Septuagint), the word nesteia is used, which is fully synonymous.
Biblical Basis for Fasting:
"They lament, 'Why don't you notice when we fast? Why don't you pay attention when we humble ourselves?' Look, at the same time you fast, you satisfy your selfish desires, you oppress your workers. Look, your fasting is accompanied by arguments, brawls,and fistfight]. Do not fast as you do today, trying to make your voice heard in heaven. Is this really the kind of fasting I want? Do I want a day when people merely humble themselves, bowing their heads like a reed and stretching out on sackcloth and ashes? Is this really what you call a fast, a day that is pleasing to the LORD? No, this is the kind of fast I want. I want you to remove the sinful chains, to tear away the ropes of the burdensome yoke, to set free the oppressed, and to break every burdensome yoke. I want you to share your food with the hungry and to provide shelter for homeless, oppressed people. When you see someone naked, clothe him! Don't turn your back on your own flesh and blood!" (Isaiah 58:3-7, NET)
History and Development of Fasting
Types of Fasts:
Reasons to Fast
How to practice fasting appropriately
Fasting can be an enriching experience that helps greatly in the process of spiritual formation and in walking more closely with God, as long as it is approached with solemnity and care.
References: The NET Bible - http://www.bible.org Fasting for Spiritual Break Through (Elmer L. Towns) Catholic Online: Lent - Fasting and Abstinence - http://www.catholic.org/clife/lent/abfast.php
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