Sahih al-Bukhari 4232
Narrated Abu Burda:
Abu Musa said, "The Prophet (ﷺ) said, "I recognize the voice of the group of Al- 
Ashariyun, when they recite the Qur'an, when they enter their homes at night, and I recognize their 
houses by (listening) to their voices when they are reciting the Qur'an at night although I have not 
seen their houses when they came to them during the day time. Amongst them is Hakim who, on 
meeting the cavalry or the enemy, used to say to them (i.e. the enemy). My companions order you to 
wait for them.' "
قَالَ أَبُو بُرْدَةَ عَنْ أَبِي مُوسَى، قَالَ النَّبِيُّ صلى الله عليه وسلم ‏
"‏ إِنِّي لأَعْرِفُ أَصْوَاتَ رُفْقَةِ الأَشْعَرِيِّينَ بِالْقُرْآنِ، حِينَ يَدْخُلُونَ بِاللَّيْلِ، وَأَعْرِفُ مَنَازِلَهُمْ مِنْ أَصْوَاتِهِمْ بِالْقُرْآنِ بِاللَّيْلِ، وَإِنْ كُنْتُ لَمْ أَرَ مَنَازِلَهُمْ حِينَ نَزَلُوا بِالنَّهَارِ، وَمِنْهُمْ حَكِيمٌ، إِذَا لَقِيَ الْخَيْلَ ـ أَوْ قَالَ الْعَدُوَّ ـ قَالَ لَهُمْ إِنَّ أَصْحَابِي يَأْمُرُونَكُمْ أَنْ تَنْظُرُوهُمْ ‏"‏‏.‏