Sa'id bin al-Musayyib (may Allah have mercy on him) said that the Messenger of Allah (peace and blessings be upon him) said: "The pledged item is not to be withheld." Ma'mar said: I said to him (al-Zuhri): Tell me, does your statement "The pledge is not to be withheld" refer to a man saying: If I do not bring you your money, this pledge is yours? He said: Yes. Ma'mar said: Later it reached me from him that he said: If it perishes, this man's right is not lost; it perishes only as the loss of the owner of the pledge, for its gain is his and its loss is his.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الرهن / 11222