No falsehood could enter it, presently or afterwards; a revelation from a Most Wise, Praiseworthy.
Translation endnotes
[41:41-42] The Quran is not ink and paper, it is in the hearts of those who have knowledge (29:49). The message is specifically protected by God, not by humans (15:9). The extraordinary mathematical composition of the Quran testifies that any addition, deletion or distortion will be exposed. The code 19 shows that early attempts to distort the Quran have failed. Like a gold ring with a pattern of diamonds on it, the Quran as it was designed by God, has always existed and will always exist. With its built-in error-correction program, the Quran even helps us to identify scribal errors. Those who know the chemical and physical properties of gold and diamonds and those who witness the unique pattern of diamonds can recognize the precious ring and identify any fraudulent addition or even subtraction from its diamonds. None, especially those who had no clue about the unique physical and chemical properties of the ring, could have tampered with the Quran. See 15:9; 9:127.