Does God warn that "all liars" will be cast into the lake of fire?
Yes. Revelation 21:8
So, if you are a habitual liar, beware!
And, if you are a habitual sinner of any kind, beware!
(Revelation 21:8, and the other "sin list" passages
found in 1 Corinthians, Galatians, Ephesians, Colossians)