Korach

In this week's parasha, we read of Korach's uprising against Moshe and Aharon. In Pirkei Avot (chapter 5) we learn: "Any machloket / dispute that is for the sake of Heaven will stand. Any machloket that is not for the sake of Heaven will not stand. What is a machloket that is for the sake of Heaven? The halachic disagreements in the Talmud between Hillel and Shammai. What is a machloket that is not for the sake of Heaven? The dispute of Korach and his cohorts."

According to Pirkei Avot 5:8, the mouth of  the earth the swallowed Korach was one of ten things made just before the first Shabbat of creation.