Upholding is mentioned in the Quran in these verses:

[2:189] They ask you about the phases of the moon! Say, “They provide a timing device for the people, and determine the time of Hajj.” It is not righteous to beat around the bush; righteousness is attained by upholding the commandments and by being straightforward. You shall observe God, that you may succeed.

[43:21] Have we given them a book before this, and they are upholding it?

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