The first altar mentioned in the Word was the one built by Noah after he came out of the ark, after being saved from the great flood. On that altar, he sacrificed clean animals to the Lord.

Mountains represent the Lord because of their height; we need to raise our thoughts above worldly things when "talking" with the Lord. An altar is a small artificial mountain. When it's used in worship, it can call to mind this raising of thought. The fire and smoke that rise from an altar are symbolically being sent to the Lord.

Most altars were made from unhewn stones. Stones represent truths. Unhewn stones - ones that have not been shaped by men - represent truths from the Word, truths that have not been adulterated.

The clean beasts to be sacrificed represent good things, charitable acts done because they are right. The clean birds represent thoughts about doctrine and actions, and about what is right. Presenting these things is an acknowledgment that we have them from the Lord, and a giving thanks to Him for them.

In the Israelitish Tabernacle, the altar of burnt offering represented the acknowledgment of good and the altar of incense that of truth. For this reason this larger altar, which was outside by the door, was made of brass which signifies natural good, while the altar of incense was made of gold, which signifies love to the Lord from whom comes truth.

9400. 'And said, Behold the blood of the covenant' means that by means of this truth the Lord's Divine Human is joined to heaven and to earth. This is clear from the meaning of 'the blood' as Divine Truth emanating from the Lord's Divine Human, dealt with above in 9393, 9399; and from the meaning of 'the covenant' as a joining together, also dealt with above, in 9396. The reason why it is a joining to heaven and to earth is that the Divine Truth which emanates from the Lord's Divine Human passes through the heavens, right on to mankind in the world; and on the way down it is adapted to suit each heaven, and ultimately mankind itself. Divine Truth on our planet is the Word, 9350-9362, which is composed in such a way that it has, in every detail, an inward sense intended for the heavens, and finally an outward sense, which is the literal sense, intended for mankind. From this it is evident that through the Word the Lord is joined to the heavens and to the world, 2143, 7153, 7381, 8920, 9094 (end), 9212 (end), 9216 (end), 9357, 9396.

[2] All this leads to the definite conclusion that without the Word on this planet heaven would not be joined to mankind, and neither therefore would the Lord, and if that conjunction did not exist the human race on this planet would entirely perish. For what composes a person's interior life is God's truth flowing in from the Lord. This truth is light itself, enlightening the person's inner sight, that is, his understanding; it is also the heavenly heat, held within that light, which is love, warming and bringing life to the will part in the internal man. Left without this light and heat therefore the inner being of a person would become blind and cold and it would die, in the same way that a person's outward being would if left without the heat and light of the worldly sun. But all this will seem to be absurd to those who do not believe that the Word is of such a nature, also to those who believe that life in a person is intrinsically his own and not something flowing in unceasingly from the Lord by way of heaven.

The life within a person is not intrinsically his but flows in from the Lord, see 4249, 4882, 5147, 5150, 5986, 6053-6058, 6189-6215, 6307-6327, 6466-6495, 6598-6626, 6982, 6985, 6996, 7055, 7056, 7058, 7147, 7270, 7343, 8685, 8701, 8717, 8728, 9110, 9111, 9223, 9276.

Before the Lord's eyes His Church, spread throughout the world, is like one human being, 9276, in the same way as heaven is, which is consequently called the Grand Man. The Church, where the Word exists, is like the heart and lungs in that human being, and all outside the Church receive life from it, even as the members, viscera, and all other organs of the body receive life from the heart and lungs, 2054, 2853, 7396.