Maliks Muwatta Book 36, Hadith Number 13D.
Yahya said that he heard Malik speak about two men who had a pledge between them. One of them undertook to sell his pledge, and the other one had asked him to wait a year for his due. He said, “If it is possible to divide the pledge, and the due of the one who asked him to wait will not be decreased, half the pledge which is between them is sold for him and he is given his due. If it is feared that his right will be decreased, all the pledge is sold, and the one who undertook to sell his pledge is given his due from that. If the one who asked him to wait for his due is pleased in himself, half of the price is paid to the pledger. If not, the pledger is made to take an oath that he only asked him to wait so that he could transfer my pledge to me in its form.’ Then he is given his due immediately.”
Yahya said that he heard Malik say about a slave whose master had pledged him and the slave had property of his own, “The property of the slave is not part of the pledge unless the broker stipulates that.”