That the Messenger of Allah (ﷺ) said: "For a boy, there is an 'Aqiqah. So spill blood for him and remove the harm from him."
Jami` at-Tirmidhi Book 19, Hadith 26
← Previous Hadith That his father said: "I saw the Messenger of Allah (ﷺ) say the Adhan in the ear of Al-Hasan bin 'Ali - when he was born to Fatimah - the Adhan of Salat."

Jami` at-Tirmidhi Book 19, Hadith 25 Next Hadith → Another chain with similar.

Jami` at-Tirmidhi Book 19, Hadith 27