The Book of Virtue, Enjoining Good Manners, and Joining of the Ties of Kinship
حَدَّثَنَا عُبَيْدُ اللَّهِ بْنُ مُعَاذٍ الْعَنْبَرِيُّ، حَدَّثَنَا أَبِي، حَدَّثَنَا شُعْبَةُ، عَنِ الْمِقْدَامِ، - وَهُوَ ابْنُ شُرَيْحِ بْنِ هَانِئٍ - عَنْ أَبِيهِ، عَنْ عَائِشَةَ، زَوْجِ النَّبِيِّ صلى الله عليه وسلم عَنِ النَّبِيِّ صلى الله عليه وسلم قَالَ " إِنَّ الرِّفْقَ لاَ يَكُونُ فِي شَىْءٍ إِلاَّ زَانَهُ وَلاَ يُنْزَعُ مِنْ شَىْءٍ إِلاَّ شَانَهُ " .A'isha, the wife of Allah's Apostle (ﷺ), reported Allah's Apostle (ﷺ) as saying:Kindness is not to be found in anything but that it adds to its beauty and it is not withdrawn from anything but it makes it defective
From Sahih Muslim, whose reports the scholars accept as authentic.