Verses 1–4
first month
i.e. April.
Verses 5–7
water
(See Scofield "Numbers 20:8").
Verses 8–15
speak ye unto the rock before their eyes
See Exodus 17:5. (See Scofield "Exodus 17:5").
The rock (Christ) 1 Corinthians 10:4 once smitten, needs not to be smitten (crucified) again. Moses' act exalted himself Numbers 20:10 and implied (in type) that the one sacrifice was ineffectual, thus denying the eternal efficacy of the blood ; Hebrews 9:25,26; 10:3,11,12. The abundant water (grace reaching the need of the people, despite the error of their leader) tells of refreshing and power through the Spirit.
Verses 16–27
angel
(See Scofield "Hebrews 1:4").
Verses 28–29
died
The death of Aaron marks the end of the wanderings. Henceforth Israel marches or halts, but does not wander.
(See Scofield "Numbers 15:1").