"By the Lord of the heaven and the earth, indeed it [is the truth]." He swore by Himself that this Quran "is the truth, just as it is that you speak."
Muhammad said: Whoever places the [accusative case] (nasb) on "mithla" (just as), it is permissible for it to be for the purpose of emphasis, meaning: It is indeed a truth, a truth like your speech.
Interpretation of Surah Adh-Dhariyat from verse 24 to verse 30.
﴿فَوَرَبِّ السَّمَاء وَالْأَرْض إِنَّه﴾ أقسم بنفْسه إِن هَذَا الْقُرْآن ﴿لَحَقٌّ مِثْلَ مَا أَنَّكُمْ تَنْطِقُونَ﴾.
قَالَ محمدٌ: من نصب (مِثْلَ) فجائزٌ أَن يكون على التوكيد بِمَعْنى: إِنَّه لحقٌ حقًّا مثل نطقكم.
تَفْسِير سُورَة الذاريات من الْآيَة ٢٤ إِلَى أَيَّة ٣٠.