On the authority of Abu Abdullah Jabir, the son of Abdullah Al-Ansari (Radhiallahu Anhum):
A man asked the Messenger of Allah (Sallallaahu 'alaihi wasallam): "Do you think that if I perform the obligatory prayers, fast in Ramadan, treat as lawful that which is lawful and treat as forbidden that which is forbidden, and do nothing further, I shall enter Paradise?"
He (Sallallaahu 'alaihi wasallam) said: "Yes."
It was related by Muslim
An-Nawawi’s Hadith No.22