The old Adam noun phrase
The bad side of man from birth, known as every human's evil nature.
A : I'm sorry dad, i didn't mean to say that. B : Its ok dear, everyone has the old Adam inside, try to hold him back next time.
To show your worthy to God, you must beat the old Adam of you.
Said when you are not sure whether one's intention to change a bad habit is true or not
This phrase comes from 1 Corinthians 15:45 in the King James Version of the Bible.