Abu ’Umāmah (may Allah be pleased with him) reported that he heard the Messenger of Allah (may Allah's peace and blessings be upon him) delivering a sermon in the Farewell Hajj saying: "Fear Allah your Lord, pray your five, fast your month, give the Zakah due on your wealth, obey your rulers, and you will enter your Lord's Paradise."
The Prophet (may Allah's peace and blessings be upon him) delivered a sermon on the Day of ‘Arafah, during the Farewell Hajj in 10 AH, and it was called so because he (may Allah's peace and blessings be upon him) bid people farewell therein. He commanded all people to fear their Lord by obeying His commands and avoiding His prohibitions. He also ordered them to perform the five prayers that Allah Almighty has made obligatory every day and night, to fast the month of Ramadān, to give the Zakah due on their wealth to those who are entitled to it and not to withhold it out of stinginess, and to obey those whom Allah has assigned as their rulers when their obedience does not entail disobeying Allah. Whoever does these things that are mentioned, his reward is admission to Paradise.