Because it is through your income that will you buy food which will go on to produce your flesh. So if your income (i.e. money) is haram, then your flesh will be created by haram food because it was bought by haram money so therefore that flesh will be in hellfire.
Assalamualaikum brother... I am a Nursing graduate and work as a Nurse in the ICU.. Nursing care in the ICU involves team work, majority of my colleagues are females and i am working together with them( free mixing).. is this haram?? Is my earnings haram?? Should i leave my job ?? Please help...