52:44 wa iy yaraw kisfam minas samaai saaqiTay yaquuluu saHaabum markuum

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Ahmed Raza Khan: Mohammed Aqib Qadri:
And were they to see a portion of the sky falling, they will say, "It is a heap of clouds."

Yusuf Ali:
Were they to see a piece of the sky falling (on them), they would (only) say: "Clouds gathered in heaps!"

Pickthal:
And if they were to see a fragment of the heaven falling, they would say: A heap of clouds.