"Those are the Waters of Merivah [...]" (Numbers 20:13). From here you learn that it was set from before that Moshe would be punished at [these] Waters. See what is written, "And they returned and they came to En-mishpat (literally, the Spring of Judgment), which is Kadesh" (Genesis 14:7). That is the spring of Moshe's judgement, which is Kadesh. "Those are the Waters of Merivah and He was sanctified through them" (Numbers 20:13). And it is called Kadesh, on account of that which is stated (Numbers 20:12), "to sanctify Me in the eyes of the Children of Israel. "Those are the Waters of Merivah." There is a parable: To what is this comparable? To the son of a king that took a stone and blinded his [own] eye. Upon each and every stone, his father would say, "This is the stone that blinded my son's eye." Hence it is stated, "Those are the waters upon which the Children of Israel contended."