Jihad (Kitab Al-Jihad)
Dawud :: Book 14 : Hadith 2686
Narrated Aisha, Ummul Mu'minin:
When the people of Mecca sent about ransoming their prisoners Zaynab sent some property to ransom Abul'As, sending among it a necklace of hers which Khadijah had had, and (which she) had given to her when she married Abul'As. When the Apostle of Allah (peace_be_upon_him) saw it, he felt great tenderness about it and said: If you consider that you should free her prisoner for her and return to her what belongs to her, (it will be well). They said: Yes. The Apostle of Allah (peace_be_upon_him) made an agreement with him that he should let Zaynab come to him, and the Apostle of Allah (peace_be_upon_him) sent Zayd ibn Harithah and a man of the Ansar (the Helpers) and said: Wait in the valley of Yajij till Zaynab passes you, then you should accompany her and bring her back.