Al-Matalib al-'Aliyah 243 — What one says on hearing the muezzin

A man from Banu Hashim narrates from the Prophet (peace and blessings be upon him), like the previous hadith, that "when the Prophet (peace and blessings be upon him) heard the mu'adhdhin saying 'Allahu akbar, Allahu akbar' (Allah is the Greatest, Allah is the Greatest), he (peace and blessings be upon him) too would repeat the same words; when the mu'adhdhin said 'ashhadu an la ilaha illallah' (I bear witness that there is no god worthy of worship except Allah), he (peace and blessings be upon him) too would say the same; when he said 'ashhadu anna Muhammadan rasulullah' (I bear witness that Muhammad (peace and blessings be upon him) is the Messenger of Allah), he (peace and blessings be upon him) too would say what he said; but when the mu'adhdhin called 'hayya 'ala al-salah, hayya 'ala al-falah' (come to the prayer, come to success), he (peace and blessings be upon him) would say in reply: 'La hawla wa la quwwata illa billah' (there is no power to avoid sins and no strength to do good except with the help of Allah)."
There is weakness and a break (inqita') in its chain.