Why is there a repetition of "those who believe" (man āmana) in this āyah?

Imām Ibn al-Jawzī (d. 597/1201) summarized the scholars' opinions in his book "Zād al-Masīr" as follows:

1. Since various groups of disbelievers were mentioned alongside the believers, the phrase “whoever believes” refers back specifically to the believers.
2. It means whoever continues to maintain their faith.
3. The first mention of faith refers (more broadly to those identifying as Muslims, including) to the hypocrites' verbal declaration of Islam, while the second refers to true belief in the heart.