A miraculous fire burned at the center of the outer altar, serving as the beating heart of the Tabernacle service. This flame did not merely consume the offerings; it represented an unbroken connection between the physical and spiritual realms. It acted as a wellspring of holiness, providing the spark for all other sacred duties within the sanctuary.
The command to maintain this flame required absolute, uninterrupted continuity. The primary approach among commentators is that the fire had to burn day and night, regardless of whether there were offerings to be consumed [ביאור יש״ר, העמק דבר]. This obligation remained in force under all conditions, even on the Sabbath, and even if the priests were in a state of impurity and unable to bring offerings [תורה תמימה, מלבי״ם, חזקוני]. The flame was preserved even while the Israelites traveled through the desert. To keep the fire alive without burning the protective cloths covering the altar, the priests would place a special copper vessel over it [תורה תמימה, חזקוני].
This external fire served as the foundation for the most sacred services performed deeper inside the Tabernacle. Coals from this altar were carried inward to burn on the inner incense altar [רלב״ג, תורה תמימה], and its flames were used to kindle the Menorah [רש״י]. This connection carries a profound lesson. The highest levels of spiritual elevation, represented by the light of the Menorah and the fragrance of the incense, must be rooted in the practical, daily commitments of the outer altar. Without tangible action and sacrifice, spiritual light cannot exist [רש ר הירש]. Drawing the fire from the outside inward teaches that an individual must harness their energy from the physical world, elevate it, and use it to illuminate their inner life [חומש קה״ת].
On a personal level, the altar represents the human body and heart. A person is tasked with kindling an inner fire of enthusiasm, awe, and love for God. This internal flame must burn constantly, independent of shifting moods, serving to drive away sadness and spiritual darkness [פרדס יוסף, חומש קה״ת]. The study of Torah acts as this very fire, offering protection from sin [שפתי כהן].
The strict requirement to maintain the fire includes a severe warning against allowing it to go out. Because this warning is repeated in the Torah, anyone who extinguishes the altar fire violates two distinct prohibitions [רש״י, מזרחי]. The restriction is so absolute that the fire cannot be put out even for the sake of fulfilling another commandment, such as clearing away the ashes, and even pouring wine is forbidden if it might extinguish the flame [תורה תמימה]. Putting out even a single coal incurs the punishment of lashes. However, if the priests are negligent and simply allow the fire to die out on its own, they still violate the prohibition, but they do not receive lashes because they did not perform an active deed of extinguishing [ביאור יש״ר].