Secrets are mentioned in the Quran in these verses:
[2:33] He said, “O Adam, tell them their names.” When he told them their names, He said, “Did I not tell you that I know the secrets of the heavens and the earth? I know what you declare, and what you conceal.”
[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.
[5:109] The day will come when God will summon the messengers and ask them, “How was the response to you?” They will say, “We have no knowledge. You are the Knower of all secrets.”
[5:116] God will say, “O Jesus, son of Mary, did you say to the people, `Make me and my mother idols beside God?’ ” He will say, “Be You glorified. I could not utter what was not right. Had I said it, You already would have known it. You know my thoughts, and I do not know Your thoughts. You know all the secrets.
[6:3] He is the one God in the heavens and the earth. He knows your secrets and your declarations, and He knows everything you earn.
[6:28] As a matter of fact, (they only say this because) their secrets have been exposed. If they go back, they will commit exactly the same crimes. They are liars.
[6:59] With Him are the keys to all secrets; none knows them except He. He knows everything on land and in the sea. Not a leaf falls without His knowledge. Nor is there a grain in the depths of the soil. Nor is there anything wet or dry, that is not recorded in a profound record.
[6:73] He is the One who created the heavens and the earth, truthfully. Whenever He says, “Be,” it is. His word is the absolute truth. All sovereignty belongs to Him the day the horn is blown. Knower of all secrets and declarations, He is the Most Wise, the Cognizant.
[9:78] Do they not realize that God knows their secrets, and their conspiracies, and that God is the Knower of all secrets?
[9:94] They apologize to you when you return to them (from battle). Say, “Do not apologize; we no longer trust you. God has informed us about you.” God will see your works, and so will the messenger, then you will be returned to the Knower of all secrets and declarations, then He will inform you of everything you had done.
[9:105] Say, “Work righteousness; God will see your work, and so will His messenger and the believers. Ultimately, you will be returned to the Knower of all secrets and declarations, then He will inform you of everything you had done.”
[11:5] Indeed, they hide their innermost thoughts, as if to keep Him from knowing them. In fact, as they cover themselves with their clothes, He knows all their secrets and declarations. He knows the innermost thoughts.
[13:9] The Knower of all secrets and declarations; the Supreme, the Most High.
[18:26] Say, “God is the best knower of how long they stayed there.” He knows all secrets in the heavens and the earth. By His grace you can see; by His grace you can hear. There is none beside Him as Lord and Master, and He never permits any partners to share in His kingship.
[23:92] The Knower of all secrets and declarations; be He exalted, far above having a partner.
[32:6] Knower of all secrets and declarations; the Almighty, Most Merciful.
[34:48] Say, “My Lord causes the truth to prevail. He is the Knower of all secrets.”
[39:46] Proclaim: “Our god, Initiator of the heavens and the earth, Knower of all secrets and declarations, You are the only One who judges among Your servants regarding their disputes.”
[43:80] Do they think that we do not hear their secrets and conspiracies? Yes indeed; our messengers are with them, recording.
[49:18] God knows all the secrets in the heavens and the earth; God is Seer of everything you do.
[59:22] He is the One God; there is no other god beside Him. Knower of all secrets and declarations. He is the Most Gracious, Most Merciful.
[62:8] Say, “The death that you are trying to evade will catch up with you sooner or later. Then you will be returned to the Knower of all secrets and declarations, then He will inform you of everything you had done.”
[64:18] The Knower of all secrets and declarations; the Almighty, Most Wise.
[86:9] The day all secrets become known.
[100:9] Does he not realize that the day will come when the graves are opened?
[100:10] And all secrets are brought out.
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