Goats, as in Leviticus 16:21, 22, signify faith. Because man is regenerated by the Lord by the truth of faith, and consequently, his sins are removed and cast into hell, therefore it is said that "Aaron made the goat bear upon him all the iniquities of the children of Israel unto the land of separation, or into the wilderness." From correspondences, a goat signifies the natural man. The goat which was sacrificed, as in Leviticus 16:5-10, signifies the natural man regarding a part purified, and the goat which was sent into the wilderness regarding the natural man not purified.

(Odkazy: Apocalypse Explained 730)

352. 'The firstborn of the flock' means the holy which is the Lord's alone. This becomes clear from the firstborn in the representative Church, where everything was holy because it had regard to the Lord, who alone is 'the Firstborn'. Love and faith deriving from it are the firstborn. All love is the Lord's and not a trace of it man's, and this is why the Lord alone is 'the Firstborn'. This was represented in the Churches of the ancient era by the requirement to consecrate the firstborn of man and of beast to Jehovah, Exodus 13:2, 12, 15. It was also represented by the tribe of Levi, which in the internal sense means love - though Levi was born later than Reuben and Simeon, who in the internal sense mean faith - being taken instead of all the firstborn and becoming the priesthood, Numbers 3:40-46; 8:14-20. That the Lord as regards His Human Essence is the Firstborn of all is clear from the following statement in David,

He will cry to Me, You are My Father, My God, and the Rock of My Salvation; I will also make Him as the Firstborn, supreme over the kings of the earth. Psalms 89:26-27.

And in John,

Jesus Christ, the Firstborn from the dead, and Prince of the kings of the earth. Revelation 1:5.

Please note that the firstborn of worship mean the Lord, while the firstborn of the Church mean faith.