13th Ayah from Surah Al Mulk
And conceal your speech or publicize it; indeed, He is Knowing of that within the breasts.
Whether you keep your words secret or state them openly, He knows the contents of every heart.
And whether you keep your talk secret or disclose it, verily, He is the All-Knower of what is in the breasts (of men).
Whether you keep your talk secret or make it aloud, He knows well what lies in the hearts.
And keep your opinion secret or proclaim it, lo! He is Knower of all that is in the breasts (of men).
And whether ye hide your word or publish it, He certainly has (full) knowledge, of the secrets of (all) hearts.