Surah Yunus, Ayat 32-33

Ayat 32. Such is Allah, your Lord in truth. So after the truth, what else can there be, save error? How then are you turned away?

Ayat 33. Thus is the Word of your Lord justified against those who rebel (disobey Allah) that they will not believe (in the Oneness of Allah and in Muhammad [SAWW](PBUH) as the Messenger of Allah). 

Hazrat Abu Hurairah (May Allah be pleased with him) reported: Messenger of Allah   [SAWW](PBUH) said, "Everyone of my Ummah will enter Jannah except those who refuse". He was asked: "Who will refuse?'' He (PBUH) said, "Whoever obeys me, shall enter Jannah, and whosoever disobeys me, refuses to (enter Jannah)". [Al-Bukhari Hadith # 7280]. 

Lesson : as mentioned above in Surah Yunus Ayat 33. "those who rebel (disobey Allah) that they will not believe (in the Oneness of Allah and in Muhammad [SAWW](PBUH) as the Messenger of Allah)." The word Ummah here stands for the community which accepted the invitation of the Prophet   [SAWW] (PBUH), that is to say, the people who on his call embraced Islam. Out of this community who follow him faithfully will go to Jannah.