I heard Messenger of Allah (ﷺ) during the sermon of the Farewell Pilgrimage saying, "Be mindful of your duty to Allah; perform your five daily Salat, observe Saum during the month (of Ramadan) , pay the Zakat on your properties and obey your leaders; (if you do so) you will enter the Jannah of your Rubb".[At-Tirmidhi, who categorized it as Hadith Hasan Sahih].