An application that contains the course of the ten missionaries heaven mentioned in the hadeeth of the Prophet peace be upon him narrated that 'Abd al-Rahman bin Auf said the Messenger of Allah, peace be upon him ((Abu Bakr in Paradise and Omar in Paradise and Uthman in Paradise and Ali in Paradise and Talha in Paradise, Zubair in Paradise and Abdul Rahman bin Auf in Paradise and Saad in Paradise and Saeed in Paradise and Abu Ubaidah ibn Al-Jarrah in Paradise). Narrated by al-Tirmidhi, 3680
There are a number of other companions who were preached in Paradise as Khadija Bint Khuwaylid, Abdullah bin Salam, Okasha bin Mahsin and others, but these were called the ten missionaries of Paradise because their preaching came in one hadith, and God knows best.