Sahih Muslim | Book 7 | Hadith Number 3183

Narrated by Abu Huraira (Allah be pleased with him)
Abu Huraira (Allah be pleased with him) reported the Apostle of Allah (may peace be upon him) as saying: For one among my Ummah who shows endurance against the hardships and rigours of Medina, I would be an intercessor or a witness on his behalf on the Day of Resurrection.