[If] there is a bottle [in the upper story] full of tahor liquid, the bottle becomes tamei for seven days, [even though] the liquid remains tahor. However, if one pours [the liquid] into a different vessel, it becomes tamei. [If] a woman is kneading [dough] in a bowl, the woman and the bowl become tamei for seven days, but the dough remains tahor. However, if [the dough] is trans-ferred to a different vessel, it becomes tamei. Beis Hillel subsequently ruled like Beis Shammai.