Know you from Adam

The phrase "know you from Adam" is an idiomatic expression used to indicate that the speaker does not recognize or know someone at all. It is often used when referring to a person who is completely unfamiliar to the speaker and has never been encountered before. The phrase originates from the biblical story of Adam and Eve, where Adam is the first man created by God. Therefore, not knowing someone "from Adam" implies that they are so unfamiliar that they cannot even be recognized as being part of the same human race.