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.
(Reference: Apocalypse Revealed 625)
