Read hadith : know yourselve by hadith
Bismillahir rahmaanir raheem
Narrated Said Al-Khudri : Allah’s Apostle (S) said , “Whenever you hear the Adhan , say what the Mu’adhdhin is saying .
Narrate ‘Isa bin Talha : that he had heard Muawiya repeating the words of Adhan up to ” wa ash-hadu Anna Muhammadan Rasulul-lah (I testify that Muhammad is Allah’s Apostle (S))
Narrated Jabir bin ‘Abdullah : Allah’s Apostle (S) said ,”Whoever after listening to the Adhan says , “Allahumma Rabba hadhihi-d-da ‘watit-tammati was -salatil qa’imati ‘ ati Muhammadan al-wasilata wal – fadilata , wab ‘athu maqaman mahmudan-il-ladhi wa’ adtahu (O Allah ! Lord of this perfect call ( of not ascribing partness of you )and of the regular prayer which is going to be established ! kindly give Muhammad the right of intercession and superiority and send him (on the day of Judgement) to the best and the highest place in Paradise which you promised him ): then intercession for me will be permitted to him on the day of resurrection .