Abu Dawud Book 24, Hadith Number 3950.
Chapter : Emancipation of slaves whose price exceeds onethird of the property.
Narated By N/A : ‘Imran b Hussain said: A man emancipated six slaves at the time of his death and he had no other property. The Prophet (may peace be upon him) was informed about it. He cast lots among them, emancipated two and retained four in slavery