[Machine] I heard the Messenger of Allah ﷺ say repeatedly, when the Mu'adhin (caller to prayer) calls the Adhan, and then he pronounces the Shahada (testimony of faith), the Messenger of Allah ﷺ would also pronounce the Shahada. And when he says "Hayya 'ala As-Salah" (come to prayer), he would say "La hawla wa la quwwata illa Billah" (there is no might or power except with Allah). And when he says "Hayya 'ala Al-Falah" (come to success), he would also say "La hawla wa la quwwata illa Billah" (there is no might or power except with Allah).
سَمِعْتُ رَسُولَ اللهِ ﷺ يَقُولُ مِرَارًا إِذَا أَذَّنَ الْمُؤَذِّنُ فَتَشَهَّدَ تَشَهَّدَ رَسُولُ اللهِ ﷺ كَمَا يَتَشَهَّدُ فَإِذَا قَالَ حَيَّ عَلَى الصَّلَاةِ قَالَ «لَا حَوْلَ وَلَا قُوَّةَ إِلَّا بِاللهِ» فَإِذَا قَالَ حَيَّ عَلَى الْفَلَاحِ قَالَ أَيْضًا «لَا حَوْلَ وَلَا قُوَّةَ إِلَّا بِاللهِ»