Sahih Muslim
The Book of Pilgrimage (Kitab Al-Hajj)
Book Number: 007 / Hadith Number: 3181
Yuhannis, the freed slave of Zubair, narrated that when he was sitting with Abdullah b. 'Umar (Allah be pleased with him) during the days of turmoil, his freed slave-girl came to him. After saluting him she said: Abu Abd al-Rahmin, I have decided to leave (Medina) for the time is hard for us, whereupon Abdullah said to her: Stay here, foolish lady, for I have heard Allah's Messenger (may peace be upon him) as saying: For one who shows endurance on the hardships and rigour of it (of Medina) I would be an intercessor or a witness on his behalf on the Day of Resurrection.