Noon is mentioned in the Quran in these verses:

[17:78] You shall observe the Contact Prayer (Salat) when the sun declines from its highest point at noon, as it moves towards sunset. You shall also observe (the recitation of) the Quran at dawn. (Reciting) the Quran at dawn is witnessed.

[24:58] O you who believe, permission must be requested by your servants and the children who have not attained puberty (before entering your rooms). This is to be done in three instances – before the Dawn Prayer, at noon when you change your clothes to rest, and after the Night Prayer. These are three private times for you. At other times, it is not wrong for you or them to mingle with one another. God thus clarifies the revelations for you. God is Omniscient, Most Wise.

To learn more, read the Quran in English.

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