(39) باب مِنْ فَضَائِلِ الأَشْعَرِيِّينَ رضى الله عنهم
Abu Musa reported that Allah's Messenger (ﷺ) said:
I recognise the voice of the Ash'arites while they recite the Qur'an as they arrive during the night and I also recognise their station from the recital of the Qur'an during the night time, although I have not seen their encampments as they encamp during the day time. And there is a person amongst them, Hakim; when he encounters the horsemen or the enemies he says to them: My friends command you to wait for them.
Reference: Sahih Muslim 2499
In-book reference: Book 44, Hadith 238
USC-MSA web (English) reference(deprecated numbering scheme): Book 31, Hadith 6093