1. A Ba'al Keri (a man who has a nocturnal emission) must leave the Levite camp.
2. In the future, the righteous will revive the dead.
3. A Mitzvah is precious when done in its proper time.
4. There is a dispute about how one should spend his time on Yom Tov.
5. Everyone agrees that on Shavuos one must have some type of physical pleasure.
A BIT MORE
1. This is derived from the fact that one verse says that a Ba'al Keri "must leave the camp," and another verse says that he "may not enter the camp," implying that he must leave two camps. These are the camp of the Kohanim and the camp of the Leviyim.
2. This is derived from the fact that verses which discuss the future have similar wording to the verses which discuss how Eliyahu and Elisha revived the dead.
3. This is why we burn the fats of a Korban Pesach that is offered on Shabbos immediately, and we do not wait for Shabbos to end, even though it would be valid if the fats would be burned after Shabbos.
4. Rebbi Eliezer: He should either eat and drink, or he should learn Torah. Rebbi Yehoshua: He should eat and drink half of the time, and he should learn half of the time.
5. This is because we must show that receiving the Torah was pleasurable to us and not a burden.