During the week of Tishah B'Av, it is forbidden to cut hair or launder [clothes]. However, on Thursday it is permitted, because of the honor due the Sabbath. On the afternoon before Tishah B'Av, a person may not eat two cooked foods, nor may one eat meat or drink wine. Rabban Shimon ben Gamliel says: He need [merely] make some variance. R' Yehudah requires overturning the beds, but the Sages did not agree with him.