'Holiness' in the Bible

But the Lord said to Moses and Aaron, “Because you did not trust Me to show My holiness in the sight of the Israelites, you will not bring this assembly into the land I have given them.”

These are the waters of Meribah, where the Israelites quarreled with the Lord, and He showed His holiness to them.

When the community quarreled in the Wilderness of Zin, both of you rebelled against My command to show My holiness in their sight at the waters.” Those were the waters of Meribah of Kadesh in the Wilderness of Zin.