'An oven,' as in Malachi 4:1, signifies hell, where the people live who confirm themselves in false doctrines and evils of life from earthly and bodily loves.

In Exodus 7:3, this signifies exterior goods, which are natural, and are commonly called 'pleasant.'

(Odkazy: Apocalypse Explained 540)

When people lie or speak falsely in the Bible, it represents the "falsity of faith" and the resulting "evil of faith." This is what happens when people form their ideas based on bad information and incorrect assumptions. This leads to wrong ways of thinking and evil.

(Odkazy: Apocalypse Revealed 924; Arcana Coelestia 8908 [3-4], 9248)