'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Allah's Apostle (ﷺ) as saying: Kindness is not to be found in anything but that it adds to its beauty and it is not withdrawn from anything but it makes it defective.
Hadith ReferenceSahih Muslim / The Book of Virtue, Enjoining Good Manners, and Joining of the Ties of Kinship / Hadith: 2594