v.16 — Who rebelled after hearing?
The question identifies the rebels as those who came out from Egypt under Moses, removing any attempt to minimize the scope of the failure.
v.17 — Who provoked God for forty years?
The second question highlights the duration (“forty years”) and connects divine displeasure with the group described as those who missed the mark, evidenced by their deaths in the wilderness.
v.18 — Who was barred from entering?
The third question recalls God’s oath that some would not enter the rest, characterizing them as those who refused to comply.
v.19 — Why did they fail to enter?
The concluding inference states they were not able to enter, because of persistent refusal to trust and respond.