Allah's Messenger said: "None should call the Adhan except for one with Wudu."
Jami` at-Tirmidhi Book 2, Hadith 52
← Previous Hadith "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.'"

Jami` at-Tirmidhi Book 2, Hadith 51 Next Hadith → Abu Hurairah said: "None should call (for the prayer except for one with Wudu."

Jami` at-Tirmidhi Book 2, Hadith 53