Well you can read the story, it's in Numbers 20, the incident is described there. But the answer is still not entirely clear, it's not clear what Moses did that was so bad as to deserve this punishment.

你们可以阅读这个故事，在民数记20，讲述了这个事件,然而答案却仍然不是完全清楚的，摩西究竟做了什么,坏事才遭受这样的惩罚，还不完全清楚。

耶鲁公开课 - 旧约导论课程节选