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 : Book 44, Hadith 238 USC-MSA web (English) : Book 31, Hadith 6093 (deprecated)
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