Stunning photo - Rainbow over downtown Fort Worth right now.
Moshe Rabbeinu tells Korach that if he is right, Hashem will create a new phenomenon and the earth will open its mouth and all the sinners will be swallowed. If not, then we know that Hashem did not send Moshe. Where did Moshe get this idea from?
Rav Shimshon Pincus explains that the Torah tells us (Korach 17:5), "V'Lo Sihiyeh K'Korach ViChaAdaso", we should not engage in Machlokes like Korach. The gemara (Sanhedrin 110a) says that if you enter a Machlokes, you are oveir a Lav. This issur, says Rav Shimshon, applies to both the side that is right and the side that is wrong.
Therefore he says, if the side that is right can win the machlokes unequivocally and unanimously, then he should do so. However if the side that is wrong refuses to yield and the argument continues, then even if you are right you must be Mivater and drop the machlokes. Not doing so would constitute an issur. Unfortunately in every machlokes the latter is always the case and the side that is wrong does not yield.
This explains what Moshe Rabbeinu told Korach. If Hashem creates an unprecedented Miracle and the argument will become null and void through the absolute demise of the other side, then it will be clear that I am right and you are wrong. But if you are still around in any shape or form and continue to argue, then I will need to concede and end the machlokes even though I am right. And so it was. The earth opened up and the machlokes disappeared!
We should not expect any such miracles in our own lives. We should make our point and move on, even if we are 100% right and the other side is 100% wrong, which is never the case.