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.

487. "But leave out the court which is outside the temple, and do not measure it." (11:2) This symbolically means that the state of the church on earth, as it is still, must be set aside and not learned.

The court outside the temple symbolizes the church on earth, because that church is outside heaven, heaven being the temple (no. 486). To leave out means, symbolically, to remove, here to remove from heaven, because its state is of such a character. And not to measure means, symbolically, not to learn or investigate its character (no. 486). The reason follows: "for has been given to the gentiles, and they will tread the holy city underfoot for forty-two months."

That the court outside the temple here symbolizes the church on earth as it is still, is apparent from the following particulars in this chapter, where it is described by the great city called Sodom and Egypt, in which the Lord's two witnesses lay dead, and which afterward fell in a great earthquake, and seven thousand people by name were killed in it - and many other particulars besides.

[2] Elsewhere in the Word the court symbolizes the outward aspect of the church. For there were two courts ¹ to be crossed when entering the Temple itself in Jerusalem, and as the Temple symbolized the church in respect to its inner aspect, therefore the courts symbolized the church in respect to its outward one. Consequently strangers who came from the surrounding nations were admitted into the courts, but not into the Temple itself.

Moreover, because the court symbolized the outward aspect of the church, it symbolized therefore also the church on earth, and heaven as well in its outmost manifestations, inasmuch as the church on earth is an entryway into heaven, and so is heaven in its outmost manifestations.

[3] A court has this symbolic meaning in the following places:

Blessed is he whom You choose... He shall dwell in Your courts. We shall be satisfied with the goodness of Your house, with the holiness of Your temple. (Psalms 65:4)

Praise the name of Jehovah..., O you... who stand in (His) house, in the courts of the house of our God. (Psalms 135:1-2)

How lovely are Your habitations, O Jehovah...! My soul... indeed faints for the courts of Jehovah. (Psalms 84:1-2)

Enter into His gates with confession, His courts with praise. (Psalms 100:4)

The righteous shall flourish like a palm tree... Those who are planted in the house of Jehovah shall sprout in the courts of our God. (Psalms 92:12-13)

...a day in Your courts is better than thousands. I have chosen to stand at the door in the house of my God... (Psalms 84:10)

And so on elsewhere, as in Psalms 96:8; 116:18-19, Isaiah 1:12; 62:9, Zechariah 3:7, Ezekiel 10:3-5.

Regarding the courts of the Temple in Jerusalem, see 1 Kings 6:36; 7:12.

Regarding the courts of the new Temple, Ezekiel 40:17-44; 42:1-14; 43:4-7.

And regarding the court outside the Tabernacle, Exodus 27:9-18.

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