Ibn ‘Awn said “I wrote to Nafi’ asking him about summoning the polytheists (to Islam) at the time of fighting. So, he wrote to me “This was in the early days of Islam. The Prophet (ﷺ) of Allaah(ﷺ) attacked Banu Al Mustal…
حَدَّثَنَا مُوسَى بْنُ إِسْمَاعِيلَ، حَدَّثَنَا حَمَّادٌ، أَخْبَرَنَا ثَابِتٌ، عَنْ أَنَسٍ، أَنَّ النَّبِيَّ صلى الله عليه وسلم كَانَ يُغِيرُ عِنْدَ صَلاَةِ الصُّبْحِ وَكَانَ يَتَسَمَّعُ فَإِذَا سَمِعَ أَذَانًا أَمْسَكَ وَإِلاَّ أَغَارَ .
Anas said “The Prophet (ﷺ) used to attack at the time of the dawn prayer and hear. If he heard a call to prayer, he would refrain from them, otherwise would attack (them).
Narrated Isam al-Muzani:
The Messenger of Allah (ﷺ) sent us in a detachment and said (to us): If you see a mosque or hear a mu'adhdhin (calling to prayer), do not kill anyone.