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.

1447. That 'He said, To your seed will I give this land' means that celestial things would be granted to those who had faith in Him is clear from the meaning of 'land' and from the meaning of 'land'. That 'seed' means faith in the Lord has been shown already in 255, 256, and that 'land' means celestial things has also been shown above at verse 1 of this chapter, and in 620, 636, 662, 1066. In the sense of the fetter 'the seed of Abram' is used to mean descendants through Jacob, and 'land' the land of Canaan itself which was to be given to them as a possession, for the reason that they might represent the celestial and spiritual things of the Lord's kingdom and Church and that among them a representative Church might be established, and because the Lord was to be born in that land. But in the internal sense nothing else is meant by 'seed' then faith in the Lord, and by 'land' nothing else than celestial things, and here in particular that celestial things were to be granted to those who had faith in Him. What is meant by having faith in the Lord has been stated many times already.