Sheaths are mentioned in the Quran in these verses:

[41:47] With Him is the knowledge about the Hour (end of the world). No fruits emerge from their sheaths, nor does any female conceive or give birth, without His knowledge. The day will come when He asks them: “Where are those idols that you set up beside Me?” They will say, “We proclaim to You that none of us bears witness to that.”

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