If someone is convicted as a false witness (ed zomem), is any testimony of his from the time he testified falsely, inadmissible or is it only from the time he is convicted? If one eats non kosher meat to express insolence but not for financial reasons or because he desires it, is one disqualified from being a witness? Both these cases are debates between Rava and Abaye. Which relatives are disqualified from being witnesses? Where are the laws of relatives derived from?