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. (Using translation from Abū Dāʾūd 2635)   

كَانَ رَسُولُ اللهِ ﷺ إِذَا بَعَثَ سَرِيَّةً قَالَ «إِنْ رَأَيْتُمْ مَسْجِدًا أَوْ سَمِعْتُمْ مُؤَذِّنًا فَلَا تَقْتُلُوا أَحَدًا»  

[Machine] The Messenger of Allah ﷺ sent out a military expedition, and I was among them. He said, "If you encounter so-and-so and so-and-so, burn them with fire." When the Prophet ﷺ bid us farewell, he said, "I had commanded you to burn them with fire, but it is not appropriate to punish with the punishment of Allah. So, if you encounter them, kill them."  

بَعَثَ رَسُولُ اللهِ ﷺ سَرِيَّةً وَأَنَا فِيهِمْ قَالَ «إِنْ لَقِيتُمْ فُلَانًا وَفُلَانًا فَحَرِّقُوهُمَا بِالنَّارِ» فَلَمَّا وَدَّعَنَا النَّبِيُّ ﷺ قَالَ «إِنِّي كُنْتُ أَمَرْتُكُمْ أَنْ تُحَرِّقُوهُمَا بِالنَّارِ وَإِنَّهُ لَا يَنْبَغِي أَنْ يُعَذِّبَ بِعَذَابِ اللهِ فَإِذَا لَقِيتُمُوهُمَا فَاقْتُلُوهُمَا»