Yahya said that he heard Malik speak about a man who willed a third of his property to a man and said as well, "My slave will serve so-and-so (another man) for as long as he lives, then he is free," then that was looked into, and the slave was found to be a third of the property of the deceased. Malik said, "The service of the slave is evaluated. Then the two of them divide it between them. The one who was willed a third takes his third, as a share, and the one who was willed the service of the slave takes what was evaluated for him of the slave's service. Each of them takes, from the service of the slave or from his wage if he has a wage, according to his share. If the one who was given the service of the slave for as long as he lived dies, then the slave is freed."
Yahya said that he heard Malik speak about someone who willed his third and said "So-and-so has such- and-such, and so-and-so has such-and-such," naming some of his property, and his heirs protested that it was more than a third." Malik said, "The heirs then have an option between giving the beneficiaries their full bequests and taking the rest of the property of the deceased, or between dividing among the beneficiaries the third of the property of the deceased and surrendering to them their third. If they wish, their rights in it reach as far as they reach."
Arabic : Book 37, Hadith 1461