Albert Barnes Commentary Numbers 20:13

"These are the waters of Meribah; because the children of Israel strove with Jehovah, and he was sanctified in them." — Numbers 20:13 (ASV)

The water of Meribah – that is, “Strife.” The place is called “Meribah in Kadesh” (Numbers 27:14), and “Meribah-Kadesh” (Deuteronomy 32:51), to distinguish it from the “Meribah” of Exodus 17:2 and following.

And he was sanctified in them – An allusion doubtless to the name “Kadesh” (holy), which, though not bestowed at that time, acquired a new significance from the fact that God here vindicated His own sanctity, punishing Moses and Aaron who had trespassed against it.