"We were with the Messenger of Allah ﷺ and Bilal stood up and gave the call. When he fell silent the Messenger of Allah ﷺ said: 'Whoever says the same as this (what the Mu'adhdhin) with certainty, he will enter Paradise.  

أَنَّهُ سَمِعَ أَبَا هُرَيْرَةَ يَقُولُ كُنَّا مَعَ رَسُولِ اللَّهِ ﷺ فَقَامَ بِلاَلٌ يُنَادِي فَلَمَّا سَكَتَ قَالَ رَسُولُ اللَّهِ ﷺ مَنْ قَالَ مِثْلَ هَذَا يَقِينًا دَخَلَ الْجَنَّةَ