Numbers 20:8 (BSB)

“Take the staff and assemble the congregation. You and your brother Aaron are to speak to the rock while they watch, and it will pour out its water. You will bring out water from the rock and provide drink for the congregation and their livestock.”

From Numbers 20. Also in the ESV.

Commentary on Numbers 20:8

• John Calvin (Reformed), Calvin's Commentaries on Numbers 20:8: 8. Take the rod. It is unquestionable that the faith of Moses had now begun to waver; but we gather from his prompt obedience that it had not altogether failed; for he wastes no time in discussion, but comes straight to the rock in order that he may perform God’s command. His faith, then, was only so smothered, that its hidden rigor at once directed him to his duty.
• Matthew Henry (Presbyterian), Matthew Henry's Complete Commentary on Numbers 20:1-13: After thirty-eight years' tedious marches, or rather tedious rests, in the wilderness, backward towards the Red Sea, the armies of Israel now at length set their faces towards Canaan again, and had come not far off from the place where they were when, by the righteous sentence of divine Justice, they were made to begin their wanderings.
• John Gill (Reformed Baptist), Exposition of the Old and New Testaments on Numbers 20:8: And Moses took the rod from before the Lord..... Which was laid up somewhere in the sanctuary, as well as the rod of Aaron, Num 17:7, as he commanded him; being always faithful and obedient to him that appointed him.
• Jamieson-Fausset-Brown (Reformed), Commentary Critical and Explanatory on the Whole Bible on Numbers 20:8: Take the rod--which had been deposited in the tabernacle (Num 17:10), the wonder-working rod by which so many miracles had been performed, sometimes called "the rod of God" (Exo 4:20), sometimes Moses' (Num 20:11) or Aaron's rod (Exo 7:12).