Sheikh Naasir As-Sa’deeرحمه الله said:
“And
from the beneficial matters is that you know that the harm people may cause you
– especially in their saying bad things about you – it does NOT harm you,
but rather it harms them. That is unless you busy yourself
with giving concern to what they say, and you allow it to control your feelings. In that
case their evil speech will harm you, just as it harms them. So if you do not
pay any attention to what they say, it CANNOT harm you at all.”
Source: “Risaalat ul-Wasaa’il
il-Mufeedah lil-Hayaat is-Sa’eedah”