his: i.e. Moses' tribal rod. Compare Numbers 20:8.
smote. Instead of speaking.
twice. Showing the heat of his feeling.
drank. Compare 1 Corinthians 10:4, and see note there.
Related Commentaries of Numbers 20:11
Numbers 20:11
11 And Moses lifted up his hand, and with his rod he smote the rock twice: and the water came out abundantly, and the congregation drank, and their beasts also.