Sunan Abi Dawud 526
سنن أبي داود#526Sahihحَدَّثَنَا إِبْرَاهِيمُ بْنُ مَهْدِيٍّ، حَدَّثَنَا عَلِيُّ بْنُ مُسْهِرٍ، عَنْ هِشَامِ بْنِ عُرْوَةَ، عَنْ أَبِيهِ، عَنْ عَائِشَةَ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم كَانَ إِذَا سَمِعَ الْمُؤَذِّنَ يَتَشَهَّدُ قَالَ " وَأَنَا وَأَنَا " .
‘A’ishah said that when the Messenger of Allah (ﷺ) heard the MU’ADHDHIN uttering the testimony, he would say:“And I too, and I too”
Scholarly Authentication
The label above is the grade most of these scholars gave — one dissenting opinion no longer speaks for all of them. If any scholar calls a narration fabricated, that verdict is shown instead, whatever the others say. Each scholar's own wording:
Al-AlbaniSahih
Muhammad Muhyi Al-Din Abdul HamidSahih
Shuaib Al ArnautSahih
Zubair Ali ZaiIsnaad Hasan
In-book reference: 2:136