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.

3168. 'And they ate and drank' means making one's own the good and truth introduced in this way. This is clear from the meaning of 'eating' as being communicated and joined together, thus being made one's own, dealt with in 2187, 2343, and more specifically (since 'eating' has reference to bread and 'bread' means good, 276, 680, 2165, 2177, 2187) making good one's own; and from the meaning of 'drinking' as being communicated and joined together, thus being made one's own, dealt with in 3089, and more specifically (since 'drinking' has reference to wine and 'wine' means truth, 1071, 1798) making truth one's own. The situation is as stated above in 3167, namely that when truth is introduced into good in the rational, more so when it is joined to it, the good and truth of the spiritual man, that is, spiritual things, become made over to the natural as its own.

3089. 'Let me sip now a little water from your pitcher' means to see whether it was possible for any truth from that source to be joined to it. This is clear from the meaning of 'sipping' as an activity similar to that meant by 'drinking', but taking in only a small amount because it was to be an investigation - for 'drinking' means perceiving, see 3069, and also in the internal sense being communicated and joined together, and has reference to what is spiritual just as 'eating' has reference to what is celestial, 2187, 2343; and from the meaning of 'water' as truth, dealt with in 680, 739, 2702. Here therefore 'let me sip now a little water from your pitcher' means an investigation to see whether it was possible for any truth from that source to be joined. 'A pitcher' is a recipient which has truth in it and from which truth is obtained, 3068, 3079. The reason for this investigation was that the initial affection for truth also carried with it something from the mother that was to be separated, 3040, 3078. With anyone who is to be regenerated his initial affection for truth is largely impure, for it holds within it the desire to satisfy a purpose and an end that have himself in view, the world, glory in heaven, and similar things which regard himself and not the common good, the Lord's kingdom, still less the Lord Himself. Such affection inevitably comes first. Nevertheless the Lord purifies it gradually so that at length falsities and evils are removed and banished so to speak to the circumference. But they have nevertheless served as means.