The Torah commands us (17:5), ԀԀԀԀ ԀԀԀԀ ԀԀԀ, "Don't be like Korach and his congregation." From here we learn that we should do everything possible to avoid being involved in a machlokes.
The Chazon Ish zt'l said, "The Torah doesn't have to tell us not to start a machlokes when we are in the wrong, because it is obvious that we mustn't. The pasuk is talking to those who are innocent, yet there is a machlokes against them for no reason. Even so, the Torah says, ԀԀԀԀ ԀԀԀԀ ԀԀԀ, don't act like Korach. Seek ways to end the machlokes.
The pasuk says (16:12), ԀԀԀԀ ԀԀԀ ԀԀԀԀ ԀԀԀԀ ԀԀԀԀԀԀ, "And Moshe sent to call for Dasan and Aviram." They didn't come. Later (16:25), ԀԀԀԀ ԀԀԀ ԀԀԀԀ ԀԀ ԀԀԀ ԀԀԀԀԀԀ, "Moshe stood up and went to Dasan and Aviram." He was trying to make peace with them. Rashi (16:22) writes, ԀԀԀԀ ԀԀԀԀ ԀԀԀԀԀԀԀ ԀԀԀԀԀԀԀ, "From here we learn that one shouldn't hold on to a machlokes." We should try to make amends and stop machlokes as quickly as possible.
Rashi (Sanhedrin 110.) elaborates, "If a machlokes has already begun, it is forbidden to keep it alive. We must learn from Moshe Rabbeinu. He forgave Dasan and Aviram for disgracing him, and he himself went to them to stop the machlokes."
There is a Talmudic concept called "chazakah," which means we assume that what was probably will continue to be so. The Chasam Sofer says that ԀԀԀ ԀԀԀԀԀԀԀ ԀԀԀԀԀԀԀ can be translated as, "When it comes to machlokes, we don't assume (chazakah) that what was will continue." Dasan and Aviram were always making machlokes... Moshe tried to make peace with them. He thought, "Perhaps this time I can make peace with them."
Reb Shmuel Wosner zt'l was once asked how he merited such a long life. He answered that it was because he avoided machlokes. He told the following mashal from the Imrei Noam: A lion asked a sheep to smell his breath... The fox pointed to his nose and said, "My nose is stuffed. I can't smell anything." The Imrei Noam says that this is what one should do when a machlokes is raging. Just stay away because getting involved will only bring you trouble.
The Gemara (Sanhedrin 38:) says, "Reb Meir had three hundred parables about foxes..." Rashi (Sanhedrin 39.) tells us the parable that the holy Tana Reb Meir told: Once upon a time, a fox said to a wolf... The wolf was certainly foolish, but are we any wiser? The yetzer hara tells us to make machlokes, we listen, and then we suffer so much from it.