Mishkat al-Masabih 676
Abu Huraira said:
We were with God’s Messenger when Bilal got up and made the call to prayer. When he finished, God’s Messenger said, “If anyone says the same as this sincerely, he will enter paradise.” 

Nasa’i transmitted it.
وَعَنْ أَبِي هُرَيْرَةَ قَالَ: كُنَّا مَعَ رَسُولِ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ فَقَامَ بِلَالٌ يُنَادِي فَلَمَّا سَكَتَ قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: «مَنْ قَالَ مِثْلَ هَذَا يَقِينا دخل الْجنَّة» . رَوَاهُ النَّسَائِيّ