It is narrated from Sayyidah Asma bint Abi Bakr (may Allah be pleased with her) that when Abdullah bin al-Zubayr (may Allah be pleased with them both) was martyred, she had something that the Prophet (peace and blessings be upon him) had given her in a small piece (of cloth). She lost it, so she ordered that it be searched for, and when it was found she fell down in prostration.
Hadith Referenceالمعجم الكبير للطبراني / مسند النساء / 20653