Shabbat 14

Study Guide Shabbat 14

Which tannaitic opinion is reflected in the mishna in Zavim quoted by the gemara which listed that one who eats food that is a rishon/first degree or a sheni/second degree would disqualify teruma, but the teruma itself would not be able to pass on impurities (it would make the teruma a shlishi/third degree). Why does one who eats these impurites disqualify teruma? The gemara proceeds to go through the list of the other ordinances related to impurities and explain why the rabbis instituted each ordinance. The gemara then questions the fact that the students of Shamai and Hillel decreed that if one's hands touch food, it disqualifies teruma - wasn't this instituted by Shamai and Hillel themselves? After answering this question, the gemara then suggests that King Solomon decreed this - how can that be explained?