Moses took Korah's transgression much to heart, for he thought to himself that perhaps, after the many sins of Israel, he might not succeed in obtaining God's pardon for them. He did not therefore have this matter decided immediately, but admonished the people to wait until the following day, having a lingering hope that Korah's horde, given time for calm reflection, might themselves perceive their sin to which an excess of drink might have carried them away.
Hence he said to them: "I may not now appear before the Lord, for although He partakes of neither food nor drink, still He will not judge such actions of ours as we have committed after feasting and revelling. But 'to-morrow the Lord will show who are His.' Know ye now that just as God has set definite bounds in nature between day and night, between light and darkness, so also has He separated Israel from the other nations, and so also has he separated Aaron from the rest of Israel.
If you can obliterate the boundary between light and darkness, then only you remove the boundary of separation between Israel and the rest, but not otherwise. Other nations have many religions, many priests, and worship in many temples, but we have one God, one Torah, one law, one altar, and one high priest, whereas ye are two hundred fifty men, each of whom is imbued with the desire of becoming the high priest, as I too should like to be high priest, if such a thing were possible.
But to prove Aaron's claim to his dignity, 'this do; take you censers, Korah, and all his company; and put fire therein, and put incense upon them before the Lord to-morrow.' The offering of incense is the most pleasant offering before the Lord, but for him who hath not been called this offering holds a deadly poison, for it consumed Nadab and Abihu. But I exhort ye not to burden your souls with a deadly sin, for none but the man God will choose as high priest out of the number of you will remain alive, all others will pay with their lives at the offering of incense."
These last words of Moses, however, far from restraining them, only strengthened Korah in his resolve to accomplish his undertaking, for he felt sure that God would choose him, and none other. He had a prophetic presentiment that he was destined to be the forefather of prophets and Temple singers, and for this reason thought he was specially favored by God.