Sahih Muslim
The Book of Pilgrimage (Kitab Al-Hajj)
Book Number: 007 / Hadith Number: 3183
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.