Ten Companions Promised Jannah
Question

Who were the ten people the Prophet (peace and blessings of Allah be upon him) told they would go to Paradise?
Praise be to Allah.The ten people who were given the glad tidings of Paradise were the Companions of the Prophet (peace and blessings of Allah be upon him) who are mentioned in the hadith narrated by ‘Abd al-Rahman ibn ‘Awf, who said:
The Messenger of Allah (peace and blessings of Allah be upon him) said: “Abu Bakr will be in Paradise , `Umar will be in Paradise, `Uthman will be in Paradise , `Ali will be in Paradise, Talhah will be in Paradise, al-Zubayr will be in Paradise, `Abd al-Rahman ibn `Awf will be in Paradise, Sa`d will be in Paradise, Sa`id will be in Paradise , and Abu `Ubaydah ibn al-Jarrah will be in Paradise.” (Narrated by al-Tirmidhi, 3747). 
Sa’d is Sa’d ibn Abi Waqqas, and Sa’id is Sa’id ibn Zayd. There are also a number of other Companions who were given the glad tidings of Paradise, such as Khadijah bint Khuwaylid, `Abd-Allah ibn Salam, `Ukashah ibn Muhsan and others, but the ten mentioned above are called the ten who were given the glad tidings of Paradise because their glad tidings came in one hadith. 
And Allah knows best.