The Mishnah taught that the king could neither judge nor be judged, testify nor be testified against. The king could not perform the ceremony to decline Levirate marriage (, "chalizah") nor could the ceremony be performed to his wife. The king could not perform the duty of a brother in Levirate marriage (, "yibbum"), nor could that duty be performed to his wife. Rabbi Judah taught that if the king wished to perform "halizah" or "yibbum", he would be remembered for good. But the rabbis taught that even if he wished to do so, he was not listened to, and no one could marry his widow. Rabbi Judah taught that a king could marry a king's widow, for David married the widow of Saul, as reports, "And I gave you your master's house and your master's wives to your bosom."