Ziyad bin Al-Harith As-Suda'i narrated: "Allah's Messenger ordered me to call the Adhan for the Fajr prayer. I called the Adhan, then Bilal wanted to call the lqamah. Allah's Messenger said: 'Indeed the brother from Suda' has called the Adhan, and whoever calls the Adhan he calls the Iqamah'."
The importance of obedience is further highlighted in this hadith as even though Bilal wanted to do something good by calling out both adhans he still followed what Allah's Messenger said instead of doing his own thing which shows us how important obedience really is in Islam.