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.

4448. 'Shechem my son' means the truth derived from that good. This is clear from the representation of 'Shechem' as interior truth, dealt with in 4430, and so truth derived from the good meant by Hamor, 4447. Actually all the truth of the Church is derived from its good; such truth never arises from any other source. This truth which Shechem represents is called interior truth, being in essence nothing other than the good of charity. Indeed the Most Ancient Church, being celestial, was governed by the good of love to the Lord and as a consequence they had a perception of all truth; for the members of that Church were almost as angels. They also had communication with angels, that being the source of their perception. They never therefore reasoned about any truth of faith, but simply said 'Yes, that is the truth' because they had a perception of it from heaven. They did not even wish to make mention of faith, but of charity instead, see 202, 337, 2715, 2718, 3246. For this reason it is the good of charity that is meant at this point by interior truth. As regards the remnants of that Church existing with Hamor the Hivite and his son Shechem, see immediately above in 4447.

[2] With the Ancient Church, which was spiritual, it was different. This Church was not governed like the Most Ancient Church by love to the Lord but by charity towards the neighbour. Nor was it able to arrive at charity except through the truth of faith, of which, unlike the Most Ancient people, they did not have any perception and therefore began to make investigations into whether the truth was the truth. Regarding the difference between celestial people who had perception and spiritual ones who do not, see 2088, 2669, 2708, 2715, 3235, 3240, 3246, 3887.