"Those are the companions of the right" means: those who are fortunate/blessed in their own souls, and they are the people of Paradise.

Yahya: From al-Mubarak ibn Fadala, from al-Hasan, who said: The Messenger of Allah (ﷺ) said: "Whoever emancipates a believing slave, it is his ransom from the Fire."

Yahya: From al-Jarud, from Atiyyah al-Awfi, from Abu Sa'id al-Khudri, who said: The Messenger of Allah (ﷺ) said: "Any Muslim who feeds a Muslim during a time of hunger, Allah will feed him on the Day of Resurrection from the fruits of Paradise."