Qatadah reports that Abdullah bin Zubair (may Allah be pleased with him) led the funeral prayer of Uthman (may Allah be pleased with him) and buried him, and Uthman (may Allah be pleased with him) had made this bequest to him.
Hadith Referenceمسند احمد / مسند الخلفاء الراشدين / 549
Hadith Gradingحکم دارالسلام:إسناده منقطع، قتاده لم يدرك عثمان