Jami` at-Tirmidhi 616

Sulaim bin Amir narrated:"I heard Abu Umamah saying: I heard the Messenger of Allah giving a Khutbah during the Farewell Hajj, and he said: 'Have Taqwa of your Lord, and pray your five (prayers), and fast your month, and pay the Zakat on your wealth, and obey thosewho are in charge of you, you will enter the Paradise of your Lord.'" He said: "I said to Abu Umamah: 'How old were you when you heard this Hadith (from the Messenger of Allah)?' He said: 'I heard it when I was thirty years old