Sunan Abi Dawud 522
سنن أبي داود#522SahihAbu Sa’id al-Khudri reported the Messenger of Allah (May peace be upon him) as saying :When you hear the Adhan, you should repeat the same words as the mu’adhdhin pronounces
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Al-AlbaniSahih
Muhammad Muhyi Al-Din Abdul HamidSahih
Shuaib Al ArnautSahih
Zubair Ali ZaiSahih Bukhari (611) Sahih Muslim (383)
In-book reference: 2:132