مَنْ ادَّعَى مَا لَيْسَ لَهُ، فَلَيْسَ مِنَّا، وَلْيَتَبَوَّأْ مَقْعَدَهُ مِنَ النَّارِ
Translation: Whoever falsely claims what does not belong to them is sternly warned that such conduct is not of our way and that they should prepare a seat in the Fire.
Source: مسلم
ادَّعَى means “claimed,” and مَا لَيْسَ لَهُ means “what is not theirs.” لَيْسَ is a negative verb; لَهُ conveys belonging to or being due to someone. وَلْيَتَبَوَّأْ is a command-form expression used here as a stern warning.
Deliberately claiming another’s property, status, qualifications, or identity violates honesty. The strong wording فَلَيْسَ مِنَّا condemns the action; it does not empower a learner to pronounce a final judgment on a particular person’s faith.