The Prophet ﷺ said: We have not made peace with them since we fought with them, so he who leaves any of them alone through fear does not belong to us.
قَالَ رَسُولُ اللَّهِ ﷺ مَا سَالَمْنَاهُنَّ مُنْذُ حَارَبْنَاهُنَّ وَمَنْ تَرَكَ شَيْئًا مِنْهُنَّ خِيفَةً فَلَيْسَ مِنَّا