Hadithcore
Sahih Muslim, 385
sahih

'Umar b. al-Khattab reported:

The Messenger of Allah (ﷺ) said: When the Mu'adhdhin says: Allah is the Greatest, Allah is the Greatest, and one of you should make this response: Allah is the Greatest, Allah is the Greatest; (and when the Mu'adhdhin) says: I testify that there is no god but Allah, one should respond: I testify that there is no god but Allah, and when he says: I testify that Muhammad is the Messenger of Allah, one should make a response: I testify that Muhammad is Allah's Messenger (ﷺ) . When he (the Mu'adhdhin) says: Come to prayer, one should make a response: There is no might and no power except with Allah. When he (the Mu'adhdhin) says: Come to salvation, one should respond: There is no might and no power except with Allah, and when he (the Mu'adhdhin) says: Allah is the Greatest, Allah is the Greatest, then make a response: Allah is the Greatest, Allah is the Greatest. When he (the Mu'adhdhin) says: There is no god but Allah, and he who makes a re- sponse from the heart: There is no god but Allah, he will enter Paradise.

حَدَّثَنِي إِسْحَاقُ بْنُ مَنْصُورٍ، أَخْبَرَنَا أَبُو جَعْفَرٍ، مُحَمَّدُ بْنُ جَهْضَمٍ الثَّقَفِيُّ حَدَّثَنَا إِسْمَاعِيلُ بْنُ جَعْفَرٍ، عَنْ عُمَارَةَ بْنِ غَزِيَّةَ، عَنْ خُبَيْبِ بْنِ عَبْدِ الرَّحْمَنِ بْنِ إِسَافٍ، عَنْ حَفْصِ بْنِ عَاصِمِ بْنِ عُمَرَ بْنِ الْخَطَّابِ، عَنْ أَبِيهِ، عَنْ جَدِّهِ، عُمَرَ بْنِ الْخَطَّابِ قَالَ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم ‏

‏ إِذَا قَالَ الْمُؤَذِّنُ اللَّهُ أَكْبَرُ اللَّهُ أَكْبَرُ ‏.‏ فَقَالَ أَحَدُكُمُ اللَّهُ أَكْبَرُ اللَّهُ أَكْبَرُ ‏.‏ ثُمَّ قَالَ أَشْهَدُ أَنْ لاَ إِلَهَ إِلاَّ اللَّهُ ‏.‏ قَالَ أَشْهَدُ أَنْ لاَ إِلَهَ إِلاَّ اللَّهُ ثُمَّ قَالَ أَشْهَدُ أَنَّ مُحَمَّدًا رَسُولُ اللَّهِ ‏.‏ قَالَ أَشْهَدُ أَنَّ مُحَمَّدًا رَسُولُ اللَّهِ ‏.‏ ثُمَّ قَالَ حَىَّ عَلَى الصَّلاَةِ ‏.‏ قَالَ لاَ حَوْلَ وَلاَ قُوَّةَ إِلاَّ بِاللَّهِ ‏.‏ ثُمَّ قَالَ حَىَّ عَلَى الْفَلاَحِ ‏.‏ قَالَ لاَ حَوْلَ وَلاَ قُوَّةَ إِلاَّ بِاللَّهِ ‏.‏ ثُمَّ قَالَ اللَّهُ أَكْبَرُ اللَّهُ أَكْبَرُ ‏.‏ قَالَ اللَّهُ أَكْبَرُ اللَّهُ أَكْبَرُ ‏.‏ ثُمَّ قَالَ لاَ إِلَهَ إِلاَّ اللَّهُ ‏.‏ قَالَ لاَ إِلَهَ إِلاَّ اللَّهُ ‏.‏ مِنْ قَلْبِهِ دَخَلَ الْجَنَّةَ ‏

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References2 variants
In-Book Reference
Book 4, Hadith 14
USC-MSA web (English) reference
Book 4, Hadith 748 (deprecated numbering scheme)
Sharh · explanationclick to expand
The aim of azan (call to prayer) is to inform people about its exact time. The call words are comprehensive for the Islamic doctrine of faith. In this hadith, the Prophet (ﷺ) commands Muslims to repeat what the caller is saying. Despite its being short, the sentence, “Allah is the greatest" refers to His perfection and negates any meaning that may contradict so. It may mean that He is too great that we can realize His greatness. The testimony of faith has two parts. The first one is to prove monotheism, mean that no god worthy of worship except Allah, and negate its opposite of having any partnership. It is the testimony that has precedence and priority over any other issue in Islam. The other part is to declare and prove the message of Prophet Muhammad (ﷺ), which directly comes after the testimony of Allah’s oneness. Afterward, the caller urges Muslims twice to come to perform prayer, which mentioned after proving the Prophet's message, for we know the obligation of prayer from the Prophet’s teachings, not due to human realization. Then, the caller commands Muslims twice to come to success, victory, and permanent bliss. After these two sentences, the listener should say, “There is neither might nor power except with Allah.” It is as if a Muslim confirmed his weakness that he had no help with prayer or success except through Allah's support. In the end, the Prophet (ﷺ) confirms that whoever repeats, with his tongue and heart, what the call says will enter Paradise, for repeating these words confirms the oneness of Allah along with glorifying, obeying, surrendering, praising, trusting, and seeking His help. Finally, this hadith urges Muslims to sincerity and encourages them to repeat the words of the call to prayer..
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