Hadithcore
Hisn al-Muslim, 22

Repeat what the Mu'adh-dhin says, except for when he says: Hayya 'alas-Salāh (hasten to the prayer) and Hayya 'alal-Falāh (hasten to salvation). Here you should say: Lā ḥawla wa lā quwwata 'illā billāh. There is no might and no power except by Allah. Reference: Al-Bukhari 1/152, Muslim 1/288.

يقول مثل ما يقول المؤذن إلا في (حي على الصلاة ، وحي على الفلاح) فيقول لا حول ولا قوة إلا بالله.

References1 variant
In-Book Reference
Book 1, Hadith 22
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