He Was Proved Holy

Numbers 20:12-13 NIV
But the Lord said to Moses and Aaron, “Because you did not trust in me enough to honor me as holy in the sight of the Israelites, you will not bring this community into the land I give them.”
13 These were the waters of Meribah, where the Israelites quarreled with the Lord and where he was proved holy among them.

Moses failed to honor the Holy Lord before the people of Israel and for this reason was rebuked.
God provided water from the rock despite the disobedience, just as He provided living water through Jesus Christ, Who is our rock and capstone of the new temple which is His body.