مَنْ انْتَهَبَ نُهْبَةً، فَلَيْسَ مِنَّا
Whoever snatches property by plunder is not following our way.
Source: الترمذي
انْتَهَبَ means to seize or plunder property, while نُهْبَةً describes what is taken through such plunder. The prefix فَـ in فَلَيْسَ مِنَّا joins the consequence to the condition. This is a severe moral warning, not an automatic judgment on a particular person's faith.
Taking another person's possessions by force, seizing goods in a crowd, or exploiting the weak is wrongful. The narration teaches respect for property rights and public safety. Neither opportunity nor personal need automatically gives one permission to take another person's property.