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.

2056. That 'the uncircumcised male' means one who does not possess the truth of faith is clear from the meaning of 'a male' as the truth of faith, dealt with above in 2046. 'The uncircumcised male' here therefore means one who does not possess the truth of faith and so is subject to falsity. 'Uncircumcised' has reference to what stands in the way and defiles, as stated already. When added to the word 'male' it refers to that which stands in the way of and defiles truth. And when added in a similar way to anything else it means the degradation and corruption of that same thing, as with 'an uncircumcised ear' in Jeremiah,

On whom shall I speak and testify and they will hear? Behold, their ear is uncircumcised, and they cannot listen. Behold, the Word of Jehovah has become a reproach; they have no wish for it. Jeremiah 6:10.

'Uncircumcised ear' stands for the fact that they did not listen at all and that to them the Word was a reproach.

[2] The present verse also deals with those inside the Church who are subject not only to falsity but also to the impurity of self-love and love of the world, for this verse continues what has gone before. Hence the statement 'the uncircumcised male who is not circumcised in the flesh of his foreskin' - thus having the meaning of falsity joined to impurity of life. How much those persons are in danger of eternal condemnation becomes clear from what has been stated above in 2051. Here it means in particular people inside the Church who profane the goods and truths of faith, of whom it is said that 'that soul will be cut off from his peoples'. For unlike those outside the Church, they are capable of profaning, as shown in Volume One, in 593, 1008, 1010, 1059.