And if We had made it a Quran in a foreign tongue, they surely would have said, Why not its verses have been made clear? What, a book in foreign tongue and the Prophet Arabian. Say you, 'that is a guidance and a cure for the believers.' And those who believe not, in their ears is a plug and to them it is a blindness. They are like those. Who are called from a far off place. [41:44]
It is narrated on the authority of Jabir that Nu'man b. Qaufal came to the Holy Prophet (may peace be upon him) and said: Would I enter Paradise if I say the obligatory prayers and deny myself that which is forbidden and treat that as lawful what has been made permissible (by the Shari'ah)? The Holy Prophet (may peace be upon him) replied in the affirmative.