Praise of the Jewish people for fulfillment of rabbinic decrees: Eruvin 21b Punishment for ignoring Rabbinic Decisions: Berachot 4b; Shabbat 110a; Eruvin 21b Punishment for mocking the words of the Sages: Eruvin 21b
Why weren't rabbinic laws written directly into the Written Torah: Eruvin 21b
The great benefits which come from studying rabbinic law: Eruvin 21b