Abu Dawud Book 24, Hadith Number 3934.
Chapter : The view that a slave will not be required to work for purchasing his freedom.
Narated By N/A : The tradition mentioned above has also been narrated by Ibn ‘Umar through a different chain of transmitters to the same effect as-mentioned by Malik. In this version there-is no mention of the words “otherwise he will be emancipated to the extent of the first man’s share.” His version ends “and the slave be thus emancipated,” to the same effect as he (Malik) mentioned.