According to a hadith, three things of a Muslim are forbidden for another Muslim: his blood, wealth and honour. Here, the word ‘Muslim’ should be taken as representing every human being. In the society where you live you cannot subject another person to physical harm. Killing is an extreme form of physical harm. Similarly, you can take another’s wealth only as part of business dealing or if he himself happily gives it to you. Exploiting another person in matters of money is unlawful. It is also unlawful to attack someone’s honour. That is, character assassination is unlawful. You can criticize another person if you have a valid argument, but you cannot doubt his intentions or declare him evil or a hypocrite.
Maulana Wahiduddin Khan