In The Name of Allaah, The Most Merciful, The Bestower of Mercy.
Abu Qutaylah narrated that Allaah’s Messenger [sallal laahu alayhi wasallam] stood before the people during the farewell hajj and said, “Neither is there a prophet after me nor an Ummah after you, so worship Allaah your Lord; establish your five daily [prayers], pay your zakaat, fast your month of [Ramadhaan], obey those who have been placed in charge over your affairs and you’ll enter paradise”.
Shaikh Zaid Bin Haadi [rahimahullaah] said, This hadeeth gathers a number of beneficial Prophetic commandments, and the first and foremost affair is to worship Allaah, which is a general command that includes all types of worship- statements and deeds, apparent [actions of the limbs] and deeds concealed [in the heart]. Then the Prophet [sallal laahu alayhi wasallam] specified some of the types of worship and the most important of them being the obligatory prayers, payment of Zakaat, fasting during the month of Ramadhaan out of Eemaan and hoping for Allaah’s reward, and obedience to the ruler of the Muslims in that which is good. The fulfilment of these affairs are a great means of entry into paradise which Allaah has prepared for His believing servants. [At-taleeqaat Al-Maleehah Alaa Silsilah Al-Ahaadeeth As-Saheehah. Vol 1 page 309. Slightly paraphrased]