´It was narrated that Abu Hurairah said:` "The Messenger of Allah said: 'When the Mu'adh-dhin calls the Adhan, say as he says.'"
Explanation & Benefits
Maulana Ataullah Sajid
Benefit:
In response to (Hayya ‘ala as-salah) and (Hayya ‘ala al-falah), one should say (La hawla wa la quwwata illa billah).
For all the remaining phrases, the words of the adhan itself should be repeated in response. See: (Sahih Muslim, Kitab as-Salat, Chapter: The Recommendation to Say What the Mu’adhdhin Says for Whoever Hears Him, etc., Hadith: 385).
Source: Commentary on Sunan Ibn Mājah by Mawlānā ‘Atā’ullāh Sājid, Page: 718