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.

433. 'Cain's being avenged sevenfold' means that it was utterly forbidden to violate separated faith meant by Cain. See what has been shown at verse 15. 'Seventy-sevenfold' means that it was something even more inviolable on account of which condemnation follows the number seven is a holy number is that the seventh day means the celestial man, the celestial Church, the celestial kingdom, and in the highest sense the Lord Himself. Consequently whenever the number seven occurs in the Word it means that which is holy or utterly inviolable. And this holiness or inviolability has reference to, or else is determined by, the subject being dealt with. The same applies to the meaning of the number seventy consisting of seven ages (saecule), ¹ for in the Word an age (saeculum) is a span of ten years. When anything extremely holy or utterly inviolable needed to be expressed people used the phrase 'seventy-sevenfold', as the Lord did, when He said that people were to forgive their brother not seven times but seventy times seven, Matthew 18:21-22. By this He meant that they were to forgive as often as he sinned. Their forgiveness was to know no limits, that is, was to be eternal and timeless, which is holy. In the present instance his being avenged seventy-sevenfold means condemnation, for it was utterly and completely forbidden to violate.

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