الصّادق (علیه السلام)- أَنِّی سَأُنْزِلُهُ عَلَیْکَ یَا مُحَمَّدُ (صلی الله علیه و آله) لا رَیْبَ فِیهِ فَقَدْ ظَهَرَ کَمَا أَخْبَرَهُمْ بِهِ أَنْبِیَاؤُهُمْ أَنَّ مُحَمَّداً (صلی الله علیه و آله) یُنْزَلُ عَلَیْهِ کِتَابٌ مُبَارَکٌ لَا یَمْحُوهُ الْبَاطِلُ یَقْرَؤُهُ هُوَ وَ أُمَّتُهُ عَلَی سَائِرِ أَحْوَالِهِمْ ثُمَّ الْیَهُودُ یُحَرِّفُونَهُ عَنْ جِهَتِهِ وَ یَتَأَوَّلُونَهُ عَلَی غَیْرِ وَجْهِهِ وَ یَتَعَاطَوْنَ التَّوَصُّلَ إِلَی عِلْمِ مَا قَدْ طَوَاهُ اللَّهُ عَنْهُمْ مِنْ حَالِ أَجَلِ (آجَالِ) هَذِهِ الْأُمَّهًِْ وَ کَمْ مُدَّهًُْ مُلْکِه.

Imam Sadiq (peace be upon him) said that when God sent Prophet Muhammad (peace be upon him) to Mecca, and then sent him to Medina, and thus strengthened him, He revealed the Quran to him, and made the beginning of its greatest Surah “Al-Mal” (in the verse “Al-Mal, that is the Book”), which means that this is the Book that I promised to My prophets who came before you, and I promised them that I would soon reveal this Book to you, O Muhammad (peace be upon him). There is no doubt about it; just as their prophets (the Israelites) had informed them before, this matter became clear that a blessed Book would be revealed to Muhammad (peace be upon him) that falsehood would not be able to destroy. He and his nation read it in all circumstances. [However] the Jews read the Quran from [the meaning and] direction He himself has distorted and misinterpreted it, and he tries very hard to attain knowledge that God has hidden from them; [such as] knowledge of the future state of the Ummah [of Muhammad] and also knowledge of the duration of Muhammad's reign and authority.

Tafsir Ahlul Bayt (peace be upon him) Vol. 1, p. 112 Bihar al-Anwar, Vol. 10, p. 14/Imam al-Askari, p. 62/Ma'ani al-Akhbar, p. 24/Bihar al-Anwar, Vol. 17, p. 217