Contradiction with Exodus 17:6
Moses strikes the rock at Horeb and water comes out, following God's direct instruction, whereas in Numbers 20:6, Moses is later instructed differently.
Exodus 17:6: Behold, I will stand before thee there upon the rock in Horeb; and thou shalt smite the rock, and there shall come water out of it, that the people may drink. And Moses did so in the sight of the elders of Israel.
Contradiction with Numbers 20:12
God reprimands Moses and Aaron for their lack of faith and not sanctifying Him, contrasting with the faith and seeking guidance shown in Numbers 20:6.
Numbers 20:12: And the LORD spake unto Moses and Aaron, Because ye believed me not, to sanctify me in the eyes of the children of Israel, therefore ye shall not bring this congregation into the land which I have given them.
Contradiction with Deuteronomy 1:37
Moses attributes God's anger leading to him not entering the Promised Land to the people, differing from the reverent act of falling on his face as in Numbers 20:6.
Deuteronomy 1:37: Also the LORD was angry with me for your sakes, saying, Thou also shalt not go in thither.
Contradiction with Exodus 4:10
Moses expresses doubt in his abilities to speak, indicating his lack of confidence, while in Numbers 20:6, he approaches God directly.
Exodus 4:10: And Moses said unto the LORD, O my Lord, I [am] not eloquent, neither heretofore, nor since thou hast spoken unto thy servant: but I [am] slow of speech, and of a slow tongue. [eloquent: Heb. a man of words] [heretofore: Heb. since yesterday, nor since the third day]
Contradiction with Psalm 106:32-33
It reflects on the rebellion at Meribah which caused trouble for Moses, including acting rashly, unlike his initial humble act in Numbers 20:6.
Psalm 106:32-33: They angered [him] also at the waters of strife, so that it went ill with Moses for their sakes: