Sayyiduna A'idh bin Amr (may Allah be pleased with him) had left instructions that his funeral prayer be led by Sayyiduna Abu Barzah al-Aslami (may Allah be pleased with him). Ubaydullah bin Ziyad rode out to lead his funeral prayer, and when he reached the palace of Hisham he was told that he had left instructions that Abu Barzah alone should lead his funeral prayer, so he turned back on his mount.
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 15117