What lie did elizabeth proctor tells danforth?

In the play " The Crucible" by Arthur Miller, Eizabeth Proctor does not lie to Judge Danforth. Instead it is Abigail Wilams who lies about John Proctor having an affair with her. Elizabeth's lie is the omission of the truth about Abigail's lust for John Proctor, which she withholds to protect her husband.