Sahih Muslim
The Book of Faith (Kitab Al-Iman)
Book Number: 001 / Hadith Number: 15
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.