Remember Allah's blessing to you and the covenant He made with you when you said, 'We hear and we obey.' Have fear of Allah. Allah knows what the heart contains. (Qur'an, 5:7)
He knows everything in the heavens and earth. He knows what you keep secret and what you divulge. Allah knows what the heart contains. (Qur'an, 64:4)
You do not engage in any matter or recite any of the Qur'an or do any action without Our witnessing you while you are occupied with it. Not even the smallest speck eludes your Lord, either on earth or in heaven. Nor is there anything smaller than that, or larger, which is not in a Clear Book. (Qur'an, 10:61)
The Messenger is only responsible for transmission. Allah knows what you divulge and what you hide. (Qur'an, 5:99)
"Our Lord! You know what we keep hidden and what we divulge. Nothing is hidden from Allah either on the earth or in heaven." (Qur'an, 14:38)
"He knows what is said openly and He knows what you hide." (Qur'an, 21:110)
Alif Lam Ra. A Book whose verses are perfectly constructed, and then demarcated, coming directly from One Who is All-Wise, All-Aware. (Qur'an, 11:1)
See how they wrap themselves round trying to conceal their feelings from Him! No, indeed! When they wrap their garments round themselves, He knows what they keep secret and what they make public. He knows what their hearts contain. (Qur'an, 11:5)
Though you speak out loud, He knows your secrets and what is even more concealed. (Qur'an, 20:7)
Do you not see that Allah knows what is in the heavens and on the earth? Three men cannot confer together secretly without Him being the fourth of them, or five without Him being the sixth of them, or fewer than that or more without Him being with them wherever they are. Then He will inform them on the Day of Rising of what they did. Allah has knowledge of all things. (Qur'an, 58:7)