Knolls are mentioned in the Quran in these verses:

[2:158] The knolls of Safa and Marwah are among the rites decreed by God. Anyone who observes Hajj or `Umrah commits no error by traversing the distance between them. If one volunteers more righteous works, then God is Appreciative, Omniscient.

To learn more, read the Quran in English.

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