Suppose you want to describe a war scene. In Persian, there is a phrase like
There were fire raining/falling from the earth and sky
What is an equivalent in English?
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The description used in your example could very much be used in English, although the grammatically correct way of saying it would be
There was fire raining from the sky
There was fire falling from the sky
I have heard people referring to "fire rain" or saying it is "raining fire" when talking about burning embers of a large forest fire or building fire falling around the area.
The expression could even refer to hot lava falling during a volcanic explosion or as used in your example to describe the use of White Phosphorous
(Image Source: Haaretz)