“Take the staff, and assemble the congregation, you and Aaron your brother, and tell the rock before their eyes to yield its water. So you shall bring water out of the rock for them and give drink to the congregation and their cattle.”
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.
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.
Commenting on Numbers 20:1-13
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.