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In Christianity, a sanctuary lamp is a flame or lamp, usually red, placed in a prominent position in the sanctuary of a church. When lit, it indicates the presence of the Blessed Sacrament—the consecrated elements of the Eucharist. In Judaism, the sanctuary lamp is known by its Hebrew name, ner tamid, which means “eternal light” or “eternal flame.” In a synagogue or temple, the ner tamid hangs above the ark containing the Torah scrolls and is never allowed to go out. How is this achieved? Discuss
Source: The Free Dictionary