The Prophet’s Guidance Concerning the Adhaan and Its Words
He ﷺ would call out the adhaan with or without repetition. He ﷺ also pronounced the words of the iqaamah once or twice, except “Qad qamat is-salaah” (Prayer has begun) twice.
He ﷺ ruled for his people that one who hears except for the words “Hayya `alas-salaah" and "Hayya `alal-falaah” , where one should say “La hawla wa la quwwata illa billaah." (There is no might and no power except through Allah.”
He ﷺ also said, “Whoever hears the adhaan and then says: ' Ash-hadu anla ilaaha ill-Allah wa anna Muhammadan rasulullah. Raditu billaahi rabban, wa bil- Islami deenan wa bi Muhammadin rasulan' (I bear witness that Muhammad is His Messenger. I am pleased
with Allah as Lord, Islam as religion and Muhammad as messenger) - whoever says that will have his sins forgiven."
He ﷺ ruled that after repeating the words of adhaan, one should invoke blessings upon ﷺ, saying: “ Allaahumma rabba hadhihid-da`watit-taamma was-salaatil- qaa'imati, aati Muhammadan al-waseelata wal- fadheelata, wab`ath-hu maqaaman mahmudan alladhi wa`adtah.' (O Allah, Lord of this perfect call and present prayer, grant Muhammad the waseelah (aposition of intercession in Paradise) and excellence and elevate him [on the Day of Judgment] to the praised position, which You have promised him.)
And he ﷺ stated that supplication between adhaan and iqaamah would never be refused [by Allah].