Numbers 16:5 (BSB)

Then he said to Korah and all his followers, “Tomorrow morning the LORD will reveal who belongs to Him and who is holy, and He will bring that person near to Himself. The one He chooses He will bring near to Himself.

From Numbers 16. Also in the ESV.

Commentary on Numbers 16:5

• John Calvin (Reformed), Calvin's Commentaries on Numbers 16:5: 5. And he spoke unto Korah. Moses did not inconsiderately choose this mode of divination, but by the dictation of the Spirit maintained the priesthood of his brother by this token and testimony; for we know how, in matters of doubt and obscurity, he was accustomed to inquire what God’s pleasure was.
• Matthew Henry (Presbyterian), Matthew Henry's Complete Commentary on Numbers 16:1-11: Here is, I. An account of the rebels, who and what they were, not, as formerly, the mixed multitude and the dregs of the people, who are therefore never named, but men of distinction and quality, that made a figure. Korah was the ring-leader: he formed and headed the faction; therefore it is called the gainsaying of Korah, Jde 1:11.
• John Gill (Reformed Baptist), Exposition of the Old and New Testaments on Numbers 16:5: And he spake unto Korah, and unto all his company,.... The two hundred fifty princes that were with him; what follows was said to them apart from Dathan and Abiram, who seem not to be present at this time; and this was after Moses had finished his prayer to God, and had received instructions from him, by an impulse on his mind, what he should...
• Jamieson-Fausset-Brown (Reformed), Commentary Critical and Explanatory on the Whole Bible on Numbers 16:5: he spake unto Korah and unto all his company--They were first addressed, not only because they were a party headed by his own cousin and Moses might hope to have more influence in that quarter, but because they were stationed near the tabernacle; and especially because an expostulation was the more weighty coming from him who was a Levite himself, and who was excluded along...