In Exodus 12:5 and Leviticus 1:3, being 'without fault' signifies unspotted innocence, for every blemish signifies some falsity or evil in the spiritual world. (Arcana Coelestia 7837)

In Revelation 14:5, being 'without fault' signifies people who are not caught in falsities, as also in Leviticus 21:17, 23, and 22:19-25.

(参考: Apocalypse Revealed 625)

7837. 'A perfect member' means spotless innocence. This is clear from the meaning of 'a member of the flock' as innocence, dealt with above in 7832; and from the meaning of 'perfect' as without blemishes, and so spotless. The reason why it had to be without blemishes and spotless was that any blemish means in the spiritual world some falsity or evil.