Collecting Rainwater from a Roof Spout and Performing Wudu with It

Question

When it rains after many days [without rain], is it permissible, after ten or fifteen minutes, to collect the water from the roof spout in some vessel or the like and use that water?

Answer

It is permissible, provided there is no impurity (najasa) in it.

Source: Fatawa Mahmudiyya

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