Do you feel secure that He who is in the heaven (man fī al-samāʾi) will not cause the earth to swallow you... Or do you feel secure that He who is in the heaven will not send against you a storm of stones?" (Surah 67:16–17)
The text issues a warning to mankind by twice identifying God as man fī al-samāʾi, which translates literally to "He who is inside the sky/heaven."
While modern, philosophically inclined apologists argue that God is an infinite spirit existing outside of space, time, and physical dimensions, the literal text of the Quran continuously places Him within a fixed, regional geographic framework.
Much like the foot-stepping controversy of Surah 50, this localization forced centuries of bitter sectarian civil wars between Islamic theologians. The rationalist Mu'tazilites and Ash'arites had to engage in extreme metaphorical gymnastics (Ta'weel) to explain this verse away, while the traditionalist Atharis maintained that God physically dwells above His creation in a specific spatial direction (Al-Uluw).
To a critic, the text simply reflects an ancient Near Eastern understanding of a deity who rules from a throne room located atop a literal multi-layered sky.