Keepers are mentioned in the Quran in these verses:

[2:187] Permitted for you is sexual intercourse with your wives during the nights of fasting. They are the keepers of your secrets, and you are the keepers of their secrets. God knew that you used to betray your souls, and He has redeemed you, and has pardoned you. Henceforth, you may have intercourse with them, seeking what God has permitted for you. You may eat and drink until the white thread of light becomes distinguishable from the dark thread of night at dawn. Then, you shall fast until sunset. Sexual intercourse is prohibited if you decide to retreat to the masjid (during the last ten days of Ramadan). These are God’s laws; you shall not transgress them. God thus clarifies His revelations for the people, that they may attain salvation.

[9:112] They are the repenters, the worshipers, the praisers, the meditators, the bowing and prostrating, the advocators of righteousness and forbidders of evil, and the keepers of God’s laws. Give good news to such believers.

[82:9] Indeed, you disbelieve in the religion.

[82:10] Oblivious to the fact that there are (invisible) keepers around you.

To learn more, read the Quran in English.

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