The Messenger (saw) clearly stated that ten of his Companions would be in Paradise:
“Abu Bakr will be in Paradise, ‘Umar will be in Paradise, ‘Uthmaan will be in Paradise, ‘Ali will be in Paradise, Talhah will be in Paradise, az-Zubayr will be in Paradise, ‘Abdur-Rahmaan ibn ‘Awf will be in Paradise, Sa’d ibn Abi Waqqaas will be in Paradise, Sa’eed ibn Zayd will be in Paradise and Abu ‘Ubaydah ibn al-Jarraah will be in Paradise.” [sahih, Ahmad from Sa’eed ibn Zayd, at-Tirmidhi from ‘Abdur-Rahmaan ibn ‘Awf, Saheeh al-Jaami’ as-Sagheer, 1/70, no. 50]
“Ten will be in Paradise: the Prophet will be in Paradise. Abu Bakr will be in Paradise, ‘Umar will be in Paradise, ‘Uthmaan will be in Paradise, ‘Ali will be in Paradise, Talhah will be in Paradise, az-Zubayr ibn al-Awwaam will be in Paradise, ‘Sa’d ibn Maalik will be in Paradise, Abdur-Rahmaan ibn ‘Awf will be in Paradise, and Sa’eed ibn Zayd will be in Paradise.” [sahih, Ahmad, Abu Dawood, Ibn Maajah, ad-Diyaa, from Sa’eed ibn Zayd Saheeh al-Jaami as-Sagheer, 4/34, no. 3905]
The Books of the Sunnah tell us that one day the Prophet (saw) was sitting at the well of ‘Arees, with Abu Musa al-Ash’ari acting as his gatekeeper. Abu Bakr as-Siddeeq came and asked permission to see him, and the Messenger of Allah (saw) said, “Let him in, and give him the glad tidings of Paradise”. Then ‘Umar came and he said, “Let him in and give him the glad tidings of Paradise”. Then ‘Uthmaan came and he said, “Let him in, and give him the glad tidings of Paradise because of an affliction that will befall him” [al-Bukhaari, Muslim and at-Tirmidhi. Jaami’ al-Usool, 8/562, no. 6372]
Ibn ‘Asaakir reported with a saheeh isnaad from Ibn Mas’oud that the Prophet (saw) said, “My successor will be in Paradise, his successor will be in Paradise, and the third and fourth will be in Paradise.” [namely, the Khulafaa Rashida] [Saheeh al-Jaami as-Sagheer, 4/149, no. 4311]
at-Tirmidhi and al-Haakim reported with a saheeh isnaad from ‘Aa’ishah that the Prophet (saw) said to Abu Bakr, “You are free from the Fire.” [Saheeh al-Jaami’ as-Sagheer, 2/24, no. 1494]