‘Alī reported God’s messenger as saying, “If anyone recites the Qur’ān, learns it by heart, declares what is lawful in it to be lawful and what is unlawful in it to be unlawful, God will bring him into paradise and make him intercessor for ten of his family all of whom have deserved hell.” Ahmad, Tirmidhī, Ibn Majah and Dārimī transmitted it, Tirmidhī saying that this is a gharīb tradition, and that Hafs b. Sulaīmān the transmitter is not strong, but is declared to be a weak traditionist.
Source: sunnah.com
Other translations
Arabic
وَعَنْ عَلِيَّ بْنَ أَبِي طَالِبٍ رَضِيَ اللَّهُ عَنْهُ قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: " مَنْ قَرَأَ الْقُرْآنَ فَاسْتَظْهَرَهُ فَأَحَلَّ حَلَالَهُ وَحَرَّمَ حَرَامَهُ أَدْخَلَهُ اللَّهُ بِهِ الْجَنَّةَ وَشَفَّعَهُ فِي عَشَرَةٍ مِنْ أَهْلِ بَيْتِهِ كُلِّهِمْ قَدْ وَجَبَتْ لَهُ النَّارُ. رَوَاهُ أَحْمَدُ وَالتِّرْمِذِيُّ وَابْنُ مَاجَهْ وَالدَّارِمِيُّ وَقَالَ التِّرْمِذِيُّ: هَذَا حَدِيثٌ غَرِيب وَحَفْص بن سُلَيْمَان الرَّاوِي لَيْسَ هُوَ بِالْقَوِيِّ يَضْعُفُ فِي الْحَدِيثِ
sunnah.com