On the authority of Abu 'Abdallah Jabir the son of 'Abdullah al Ansari (may Allah be pleased with them both):
A man asked the Messenger of Allah (may the blessings and peace of Allah be upon him): 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 said: Yes