the Prophet taught him the Adhan with nineteen phrases, and the Iqamah with seventeen phrases.
Jami` at-Tirmidhi Book 2, Hadith 44
← Previous Hadith Allah's Messenger sat with him and taught him the Adhan word for word. Ibrahim said, "It is the same as our Adhan." Bishr said: "So I said to him, 'Repeat it to me.' So he described the Adhan with At-Tarjl'."

Jami` at-Tirmidhi Book 2, Hadith 43 Next Hadith → "Bilal was ordered to make the phrases of the Adhan even, and the phrases of the Iqamah odd."

Jami` at-Tirmidhi Book 2, Hadith 45