It is narrated from Hisham bin Urwah that Abdullah bin Mas'ud, Uthman, al-Miqdad bin al-Aswad, Abd al-Rahman bin Awf and Muti' bin al-Aswad (may Allah be pleased with them) appointed al-Zubayr bin al-Awwam as the executor of their wills.
Hadith Referenceالمعجم الكبير للطبراني / العشرة / 245