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Kept burning day and night wherever the Blessed Sacrament is reserved, the sanctuary lamp indicates and honors the presence of Christ. The Code of Canon Law requires this special lamp to shine continuously before the tabernacle (canon 940), while the General Instruction of the Roman Missal (GIRM 316) directs that it be fueled by oil or wax. It is not simply a pious decoration.
Red is traditional, though not required. In sacred art and devotion, the color evokes blood, sacrifice, the fire of love, the Sacred Heart, and martyrdom. The light itself is a visible sign of reverence, pointing to Christ, the light of the world.
The practice recalls Exodus 27:20–21, where the Lord commanded Israel to keep a lamp burning continually before Him. In the sanctuary lamp, that ancient, God-commanded practice finds its New Covenant continuation: the tabernacle holds Christ Himself.
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