“The Israelites angered Yahweh at the waters of Meribah.
It went ill with Moses on their account.
They made his spirit bitter.
He spoke words that were rash.”
Then there was another incident from Numbers, chapter 20. Once again, the Israelites were angry with Moses and Aaron since they had no water. This was when Moses struck the rock at Meribah, where water came pouring out. This is similar to Exodus, chapter 12 that was mentioned in the previous psalm. However, there was a twist here in the story of Numbers. Moses and Aaron were punished for not believing that water could come from a rock. Their punishment was that they too would die before they reached the Promised Land. Moses was rash in his hesitation to strike the rock.
Eugene Finnegan Bible Project 